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6 results for “Lamprothamnium”
Fig. 4. Lamprothamnium stipitatum from the holoype specimen M.T.Casanova r888 in Charophytes of Australia's Northern Territory - I. Tribe Chareae
Fig. 4. Lamprothamnium stipitatum from the holoype specimen M.T.Casanova r888 (PERTH). (a) Habit of whole plant, scale bar: 5 cm. (b) Fertile antheridial branchlet whorl, scale bar: 1 cm. (c) Fertile antheridial branchlet whorl with basal antheridia, scale bar: 1 cm. (d) Fertile female branchlet whorl, scale bar: 1 cm. (e) Coronula of triangular cells, scale bar: 100 µm. (f) Pair of oogonia on a branched stipe, scale bar: 100 µm. (g) Light micrograph of antheridal cells in metaphase, chromosomes n = 14, 1000× magnification, image enhanced and chromosomes outlined. (h) Scanning electron micrograph (SEM) of oospore, scale bar: 100 µm. (i) SEM of detail of oospore wall, scale bar: 20 µm. (j) SEM of basal cell impression, scale bar: 50 µm.
Fig. 3. Lamprothamnium compactum, from P.Dostine 12 in Charophytes of Australia's Northern Territory - I. Tribe Chareae
Fig. 3. Lamprothamnium compactum, from P.Dostine 12DW23-2. (a) Habit of elongate shoot, scale bar: 1 mm. (b) Compact shoot with antheridia, scale bar: 1 mm. (c) Fertile whorl, scale bar: 1 mm. (d) Sterile branchlet, scale bar: 100 µm.
Fig. 2. Lamprothamnium capitatum, from C.P.Mangion 278 in Charophytes of Australia's Northern Territory - I. Tribe Chareae
Fig. 2. Lamprothamnium capitatum, from C.P.Mangion 278. (a) Axis of mature, fertile plant, scale bar: 10 mm. (b) Two sexually reproducing nodes showing internal and external basal oogonia and foliar antheridia, scale bar: 1 mm. (c) Fertile branchlet with stipitate oogonia and geminate antheridia, scale bar: 1 mm. (d) Part of an axis node with long-stipitate oosporangia at the base of branchlets, scale bar: 500 µm.
FIGURE 3 in Lamprothamnium sardoum sp. nov. (Characeae, Streptophyta): A new species of Lamprothamnium for Europe
FIGURE 3. Oospore removed from the base of plant (the only mature oospore available on the type material). A) side view of oospore, damaged via germination. Scale = 200 µm. B) Detail of oospore wall. Scale = 10 µm.
FIGURE 1 in Lamprothamnium sardoum sp. nov. (Characeae, Streptophyta): A new species of Lamprothamnium for Europe
FIGURE 1. Morphology of Lamprothamnium sardoum R.Becker. A) placement and arrangement of gametangia at the base of the whorl and on the branchlets (some branchlets removed) illustrating abundant gametangia clustered and geminate on the branchlets, as well as inside and outside the base of the whorl. Scale = 0.5 mm. B) Herbarium material (circled) showing long protonemata and fox-tail whorls. Scale = 1 cm. C) Apex of plant with several whorls. Gametangia are abundantly visible on the thallus, along with verticillate, spreading bract cells. Scale = 0.5 mm. D) Arrangment of gametangia when conjoined, antheridium above oogonium in common with other species of Lamprothamnium. Scale = 0.1 mm. E) Fertilised oospore and bract cells on a branchlet.
FIGURE 2 in Lamprothamnium sardoum sp. nov. (Characeae, Streptophyta): A new species of Lamprothamnium for Europe
FIGURE 2. Lamprothamnium sardoum in life. A) Sparse stands in shallow, brackish water in its habitat (Sardinia, 2018–04–05). Scale = 10 cm. B) Detail of the base of a whorl with abundant gametangia. Scale = 2 cm. C) Branchlet tips. Scale = 1 mm. D) Detail of single branchlet end cell. Scale = 0.5 mm. E) Oospore attached to the base of the plant. Scale = 200 µm (Photos R. Becker).
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