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17 results for “Sporolithon”
FIGURE 15 in Sporolithon yoneshigueae sp. nov. (Sporolithales, Corallinophycidae, Rhodophyta), a new rhodolith-forming coralline alga from the southwest Atlantic
FIGURE 15. Phylogenetic tree inferred from ML, MP, and NJ analyses with SSU sequences for 19 specimens from the orders Sporolithales and Hapalidiales. Values at nodes represent percentage of 1,000 bootstrap replicates for ML (left), MP (middle) and NJ (right). Branches lacking values received <70 % support.
FIGURES 7–13 in Sporolithon yoneshigueae sp. nov. (Sporolithales, Corallinophycidae, Rhodophyta), a new rhodolith-forming coralline alga from the southwest Atlantic
FIGURES 7–13. Tetrasporangial anatomy of Sporolithon yoneshigueae. 7. Magnified surface view of a protuberance showing a sorus with large tetrasporangial compartment pores (RB 505770). Scale bar = 500 μm. 8. SEM of the surface of a sorus showing tetrasporangial compartment pores (RB 569425). Scale bar = 80 μm. 9. SEM of a single tetrasporangial compartment pore surrounded by 24 rosette cells that are slightly raised towards the pore opening (RB 569425). Note the mucilage ring that forms inward of the rosette cells, which only partially occludes the pore (arrow). Scale bar = 30 μm. 10. Vertical section of the outer thallus showing numerous tetrasporangial compartments buried in distinct layers (RB 505770). Note the distinct layers of elongate cells at the base of tetrasporangial compartments. Scale bar = 300 μm. 11. Magnified view of the thallus showing the paraphyses (arrows) between tetrasporangial compartments (RB 505770). Scale bar = 60 μm. 12. Vertical section of the outer thallus showing a raised sorus (RB 505770). Note the tetrasporangial compartment bearing a single tetrasporangium (t) and an apical pore plug (arrow). Scale bar = 50 μm. 13. Magnified view of the base of a tetrasporangial compartment showing a tetrasporangium (t) subtended by a single stalk cell (arrow) (RB 505770). Scale bar = 25 μm.
FIGURE 1 in Sporolithon yoneshigueae sp. nov. (Sporolithales, Corallinophycidae, Rhodophyta), a new rhodolith-forming coralline alga from the southwest Atlantic
FIGURE 1. Bathymetric map of the Abrolhos Shelf and Vitória–Trindade Chain showing the collecting sites (arrows) (data source: ETOPO 1).
FIGURES 2–6 in Sporolithon yoneshigueae sp. nov. (Sporolithales, Corallinophycidae, Rhodophyta), a new rhodolith-forming coralline alga from the southwest Atlantic
FIGURES 2–6. Vegetative features of Sporolithon yoneshigueae. 2. General morphology of the holotype (RB 569425) showing a lumpy to fruticose growth-form. Scale bar = 3 cm. 3. General morphology of a paratype (RB 505770) showing a warty growth-form. Scale bar = 4 cm. 4. Vertical section of the inner thallus showing the monomerous, plumose (non-coaxial) internal construction (RB 569425). Scale bar = 150 μm. 5. Magnified view of the outer thallus showing a flared epithallial cell (e) and a squat subepithallial initials (i) (RB 569425). Scale bar = 10 μm. 6. SEM of a fracture showing a secondary pit connection (arrow) and cell fusions (arrowheads) (RB 569425). Scale bar = 20 μm.
FIGURE 14 in Sporolithon yoneshigueae sp. nov. (Sporolithales, Corallinophycidae, Rhodophyta), a new rhodolith-forming coralline alga from the southwest Atlantic
FIGURE 14. Phylogenetic tree inferred from ML, MP, and NJ analyses with psbA sequences for 36 specimens from the orders Sporolithales and Hapalidiales. Values at nodes represent percentage of 1,000 bootstrap replicates for ML (left), MP (middle) and NJ (right). Branches lacking values received <70 % support.
FIGURES 3–8. Specimen LAF 6956A, vegetative anatomy. FIG. 3. Thallus habit with numerous protuberances. Scale bar 9 in Sporolithon sinusmexicanum sp. nov. (Sporolithales, Rhodophyta): a new rhodolith-forming species from deepwater rhodolith beds in the Gulf of Mexico
FIGURES 3–8. Specimen LAF 6956A, vegetative anatomy. FIG. 3. Thallus habit with numerous protuberances. Scale bar 9 mm. FIG. 4. Surface view (upper bracket) and vertical fracture showing new vegetative layer (middle bracket) over older layer (lower bracket). Scale bar 176 μm. FIG. 5. Secondary hypothallium (upper bracket) over older vegetative layer (lower bracket). Scale bar 52 μm. FIG. 6. Perithallium showing cell fusions (arrows). Scale bar 34 μm. FIG. 7. Perithallium (lower bracket), epithallium (upper bracket) and intercalary meristem (arrow). Scale bar 24 μm. FIG. 8. Meristematic cells (M) and armored epithallial cells (arrows) with intact cell roofs (circle pointers). Scale bar 11 μm.
FIGURE 2 in Sporolithon sinusmexicanum sp. nov. (Sporolithales, Rhodophyta): a new rhodolith-forming species from deepwater rhodolith beds in the Gulf of Mexico
FIGURE 2. Phylogeny based on ML analyses of psbA sequences. Branch numbers indicate bootstrap values out of 1,000 replicates. Sporolithon sinusmexicanum sp. nov. shown in boldface. Stars indicate species that slough off their tetrasporangial sori after spore release.
FIGURES 18–23. Specimen LAF 6970B. FIG. 18. Thallus habit showing numerous protuberances. Scale bar 6 in Sporolithon sinusmexicanum sp. nov. (Sporolithales, Rhodophyta): a new rhodolith-forming species from deepwater rhodolith beds in the Gulf of Mexico
FIGURES 18–23. Specimen LAF 6970B. FIG. 18. Thallus habit showing numerous protuberances. Scale bar 6 mm. FIG. 19. Longitudinal section through protuberance showing perithallium with no overgrown tetrasporangial compartments. Scale bar 1.05 mm. FIG. 20. Epithallium (upper arrowhead), intercalary meristem (lower arrowhead) and perithallium (right bracket) showing cell fusions in the xaxis (arrows) and z-axis (circle pointers). Scale bar 4 μm. FIG. 21. Armored epithallial cells (arrows), one showing intact cell roof (circle pointer), and meristematic cells (M). Scale bar 14 μm. FIG. 22. Dissecting microscope view of thallus surface showing tetrasporangial sorus (arrow). Scale bar 1 mm. FIG. 23. Perithallium showing unidentified spherical inclusions (arrows), which may be unidentified life history stages of microalgal organisms. Scale bar 43 μm.
FIGURES 9–17. Specimen LAF 6956A, reproductive anatomy. FIG. 9 in Sporolithon sinusmexicanum sp. nov. (Sporolithales, Rhodophyta): a new rhodolith-forming species from deepwater rhodolith beds in the Gulf of Mexico
FIGURES 9–17. Specimen LAF 6956A, reproductive anatomy. FIG. 9. Dissecting microscope view of tetrasporangial sori (arrows). Scale bar 2 mm. FIGS. 10–11. Magnified views of sori. Scale bars 0.7 mm, 0.8 mm. FIG. 12. Surface view of tetrasporangial sorus undergoing sloughing off. Scale bar 400 μm. FIG. 13. Magnified view of sorus edge showing disintegrating pores (arrows) and rosette cells. Scale bar 110 μm. FIG. 14. Intact tetrasporangial pore (P) and rosette cells (R). Scale bar 24 μm. FIG. 15. Longitudinal section of protuberance showing tetrasporangial compartments at protuberance tip (arrow) and perithallium with no overgrown tetrasporangial compartments. Scale bar 400 μm. FIG. 16. Tetrasporangial compartments (arrows). Scale bar 70 μm. FIG. 17. Tetrasporangial stalk cell (arrow) and paraphyses surrounding tetrasporangial compartments with non-elongated cells at the base of the compartments (circle arrows). Scale bar 28.5 μm.
FIGURE 1 in Sporolithon sinusmexicanum sp. nov. (Sporolithales, Rhodophyta): a new rhodolith-forming species from deepwater rhodolith beds in the Gulf of Mexico
FIGURE 1. Phylogeny based on ML analyses of rbcL sequences. Branch numbers indicate bootstrap values out of 1,000 replicates. Sporolithon sinusmexicanum sp. nov. shown in boldface. Stars indicate species that slough off their tetrasporangial sori after spore release.
FIGURES 9–15 in Sporolithon indopacificum sp. nov. (Sporolithales, Rhodophyta) from tropical western Indian and western Pacific oceans: First report, confirmed by DNA sequence data, of a widely distributed species of Sporolithon
FIGURES 9–15. Tetrasporangial anatomy of the holotype of Sporolithon indopacificum (L 3964509). 9. Scanning electron micrograph (SEM) showing two tetra/bisporangial sori in surface view (arrowheads) (scale bar = 200 μm). 10. SEM showing a magnified view of several tetra/bisporangial chambers in surface view. Note the open, unoccluded pores (P), intact pore plugs (p) and the rosette cells surrounding the pores (scale bar = 15 μm). 11. Transverse section through two contiguously fused protuberances showing an extensive sorus (arrowheads) (scale bar = 300 μm). 12. Vertical section through the edge of a raised sorus (S) showing tetra/bisporangial chambers with floors (black arrowhead) that are flush with the surrounding vegetative surface (white arrowhead) (scale bar = 50 μm). 13. Vertical section through the edge of a raised sorus (S) showing tetra/bisporangial chambers with floors (black arrowhead) that are sunken below the surrounding vegetative surface (white arrowhead) (scale bar = 50 μm). 14. Vertical section through a sorus showing several tightly abutting, longitudinally elliptical tetra/bisporangial chambers bearing mostly uncleaved sporangia (t) borne on a single stalk cell (black arrowheads). Note the sporangial chamber pore plugs (white arrowheads), a 'T'-shaped divided tetrasporangium (T) and the sterile paraphyses of elongate cells (arrow) between two adjacent tetra/bisporangial chambers (scale bar = 50 μm). 15. Magnified view through a sorus showing three tetra/bisporangial chambers, one of which bears a zonately arranged bisporangium (B). Note the sporangial chamber pore plugs (white arrowheads) and the layer of elongate cells at the base of the sporangial chambers (black arrowheads) (scale bar = 30 μm).
FIGURES 3–8 in Sporolithon indopacificum sp. nov. (Sporolithales, Rhodophyta) from tropical western Indian and western Pacific oceans: First report, confirmed by DNA sequence data, of a widely distributed species of Sporolithon
FIGURES 3–8. Vegetative anatomy of the holotype of Sporolithon indopacificum (L 3964509). 3. Holotype specimen showing lumpy growth form with swollen, crowded protuberances (scale bar = 10 mm). 4. Magnified view of the protuberances showing their contiguously fused nature and numerous superficial sori (white arrowheads) scattered across the protuberances. Note that sori are often abraded or shed from the surface (black arrowheads) (scale bar = 2 mm). 5. Vertical section showing layers of S. indopacificum crusts (L) overgrowing itself in a superimposed manner (scale bar = 200 μm). 6. Vertical section through the monomerous thallus showing the epithallus (arrowhead) and a predominantly thick cortex (C) subtended by a thin medulla (M) (scale bar = 100 μm). 7. Vertical section of the ventral region of the thallus showing a plumose medulla (M) and cortical filaments (C) joined primarily by secondary pit connections (arrowheads) (scale bar = 50 μm). 8. Vertical section of the dorsal region of the thallus showing a single layer of flared epithallial cells (arrow) subtended by a layer of subepithallial initials (i). Note the layer of senescent epithallial cells (e) being shed, the primary pit connections between adjacent cortical filaments (black arrowheads) and a single, rare cell fusion (white arrowhead) (scale bar = 20 μm).
FIGURE 1 in Sporolithon indopacificum sp. nov. (Sporolithales, Rhodophyta) from tropical western Indian and western Pacific oceans: First report, confirmed by DNA sequence data, of a widely distributed species of Sporolithon
FIGURE 1. Phylogram of Sporolithon species inferred by maximum likelihood analysis of psbA sequences; Heydrichia species were the outgroup; sequences identified by GenBank accession number. Bolded scientific names are type specimens, topotype specimens, or specimens linked to type specimens by DNA sequence. Bootstrap support values (in %) are provided for nodes where> 50%. Scale bar refers to substitutions per site.
FIGURE 2 in Sporolithon indopacificum sp. nov. (Sporolithales, Rhodophyta) from tropical western Indian and western Pacific oceans: First report, confirmed by DNA sequence data, of a widely distributed species of Sporolithon
FIGURE 2. Phylogram of Sporolithon species inferred by maximum likelihood analysis of rbcL sequences; Heydrichia species were the outgroup; sequences identified by GenBank accession number. Bolded scientific names are type specimens, topotype specimens, or specimens linked to type specimens by DNA sequence. Bootstrap support values (in %) are provided for nodes where> 50%. Scale bar refers to substitutions per site.
FIGURES 9–12. Sporolithon mesophoticum Holotype, NCU 658543. 9 in Sporolithon mesophoticum sp. nov. (Sporolithales, Rhodophyta) from Plantagenet Bank off Bermuda at a depth of 178 m
FIGURES 9–12. Sporolithon mesophoticum Holotype, NCU 658543. 9. Surface view of tetrasporangial sori (arrows). Scale bar = 0.1 cm. 10. Surface view of tetrasprangial sorus with pores (arrows). Scale bar = 258 μm. 11. Surface view of tetrasprangial sorus with pores (arrows) including portion where upper cell layers were removed (bracket) showing top-down view of tetrasporangial compartments (stars). Scale bar = 164 μm. 12. Surface view of a tetrasporangial pore (*) with rosette cells (circle pointers). Scale bar = 27 μm.
FIGURES 2–8. Sporolithon mesophoticum Holotype, NCU 658543. 2 in Sporolithon mesophoticum sp. nov. (Sporolithales, Rhodophyta) from Plantagenet Bank off Bermuda at a depth of 178 m
FIGURES 2–8. Sporolithon mesophoticum Holotype, NCU 658543. 2. Habit of holotype. Scale bar = 3 cm. 3. Fracture of rhodolith showing sedimentary composition of nodule below S. mesophoticum crust. Scale bar = 0.8 mm. 4. Partial surface and section view of thallus (brackets) over substratum consisting of sedimentary material including remains of invertebrate organisms (arrows). Scale bar = 138 μm. 5. Vertical fracture of thallus showing monomerous construction. Scale bar = 60 μm. 6. Cell fusion (arrow). Scale bar = 13.8 μm. 7. Section and partial surface view showing epithallial cell (arrow), meristematic cell (*), and layers of short, flattened perithallial cells (P). Scale bar = 9.2 μm. 8. Surface and section view of epithallial cell (bracket, arrow), and section views of putative meristematic cell (*) and perithallial cell (P). Scale bar = 6.3 μm.
FIGURE 1 in Sporolithon mesophoticum sp. nov. (Sporolithales, Rhodophyta) from Plantagenet Bank off Bermuda at a depth of 178 m
FIGURE 1. Phylogeny of Sporolithales based on Maximum Likelihood analyses of concatenated psbA and rbcL (2,247 bp) sequences, with Membranoptera spp. (Ceramiales) as outgroup. Numbers above nodes are bootstrap values (1,000 replicates).
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