By Karl Ulrich Kramer; P S Green; Erich Götz, Dozent Dr
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Extra resources for The Families and Genera of Vascular Plants [Vol 1]
They may also be absent from those of some terrestrial species [e. g. I. andicola (Amstutz) L. D. Gomez]. When present they are situated in longitudinal bands over the air canals. The function of the ligule, which frequently withers at an early age, is unclear. Mucous is secreted from the ligular pit, at least in the young leaf (Michaux 1973) and it has been suggested that such secretion may increase nutrient flow to the young leaf meristem. Ligule shape has been used by Hickey (1986) to distinguish between taxa in the I.
Stele of stem strongly dorsiventral; leaves borne only on its dorsal side Lomariopsidaceae 18 - Stele of stem weakly or not dorsiventral 18. Veins reticulate with free included veinlets; lamina bearing articulate hairs Dryopteridaceae - Veins free, or reticulate without free included veinlets; lamina without articulate hairs but often scaly Elaphog/osmm (p. 169) Key E: Sporangia following the veins ("gymnogrammoid") or on a submarginal commissure; no indusium; veins free or joined by a submarginal commissure 1.
Indusium posteriorly attached, hood-like Cystopteris (p. 138) - Indusium cup-shaped, attached at the base and sides HymenophyfJopsis (p. 163) Key B: Sporangia few, large, simultaneously maturing, assembled in dorsal, exindusiate sori or fused 1. Sporangia fused Marattlaceae - Sporangia distinct 2 2. Lamina pedately branched, free-veined; or forked, but the ultimate divisions not pectinately arranged Maloniaceae - Lamina at least once forked (very rarely not), the ultimate divisions roundish to linear, pectinately arranged; veins free Gleicheniaceae - Lamina pinnately divided or simple 3 3.