psilotales defined in 1951 year

psilotales - psilotales;
psilotales - Order of Pteridophyta related to extinct and most primitive Pteridophytes (Psilophytales); represented by two genera, Psilotum and Tmesipteris. Usually found as subtropical or tropical epiphytes. Small, rhizomatous plants with dichotomously branched aerial shoots, vascular system protostelic to siphonostelic. Sporangia borne in groups of two or three in axils of small, two-lobed sporophylls. Homosporous, gametophytes subterranean, lacking chlorophyll, mycotrophic; bearing antheridia and archegonia scattered indiscriminately.

near psilotales in Knolik

letter "P"
start from "PS"

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