Abstract
Morphology of seven species of exindusiate thelypteroid ferns belonging to three genera,viz., Phegopteris, Pseudophegopteris andMacrothelypteris is described. The paleae are gland-tipped except inM. ornata, P. hexagonoptera andP. decursive-pinnata where it is non-glandular. The dictyostele consists of 2–4 vascular strands. The lamina bears reduced scales (sometimes branched) mixed with the hairs, both acicular and glandular. The sori are usually exindusiate; inP. decursive-pinnata the indusium is modified into tufts of fasciculated hairs whereas inM. torresiana a small fugaceous indusium is present. The trichomes are borne on the capsule wall only. Spores are of bilateral type and usually perinate. The exine is smooth or verrucate; inP. aurita andP. pyrrhorhachis it bears narrow ridge-like irregular reticulations. InM. ornata, the exine as well as perine are spinulose. It is concluded that the exindusiate species are quite distinct from the other members of the family and constitutes a natural group.
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Communicated by Dr. T. N. Khoshoo,f.a.sc.
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Chandra, P. Observations on the generaPhegopteris, Pseudophegopteris andMacrothelypteris . Proc. Indian Acad. Sci. 79, 68–79 (1974). https://doi.org/10.1007/BF03045563
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DOI: https://doi.org/10.1007/BF03045563