Venezuelan hepaticae VII. Leptoscyphopsis Schust., a genus seemingly intermediate between geocalycaceae and plagiochilaceae (jungermanniales)

摘要

Leptoscyphopsis Schust. (1978), known from a single collection from montane Venezuela, exhibits criteria suggestive of Plagiochilaceae (free formation of geotropic microphyllous branches; vestigial underleaves; bilateral gynoecia) but is soft-textured and readily blackens in drying, as in many Geocalycaceae subfam. Lophocoleoideae. It is suggestively like Pseudolophocolea of the last group in the large, virtually homogeneous oil-bodies; the very reduced underleaves and gynoecial bracteoles; the wide open and rather bilabiate perianth. The genus is of interest in seeming to confirm a close affinity of Geocalycaceae and Plagiochilaceae.