FIGURES 11–16. Nitella axillaris. 11. Whorl with a in Taxonomy and phylogeny of Nitella (Charophyceae, Characeae) from Brazil with emphasis on the midwest and southeast regions

FIGURES 11–16. Nitella axillaris. 11. Whorl with a small, axillary, sessile, compacted head, at a node of the thallus. 12. Whorl with a long, axillary, stipitate and compacted head. 13. 2-furcated fertile branchlet of a head. The black and red arrows indicate, respectively, the primary and the secondary nodes. 14. Dactyls 2-celled, abbreviated, forming a crown. Penultimate cell tapering gradually towards the base of end cell. End cell conical, acute or acuminate. 15. Oospore membrane with reticulate aspect under LM. 16. Oospore membrane with beaded imperfect reticulate aspect under SEM.