Thysanosoria
Content
Description
Like Lomariopsis Fee in habit and in form of sterile fronds, differing in fertile pinnae which have a small rounded marginal lobe at each vein-ending, the sporangia in separate sori, one at the end of each vein and spreading a little back- wards along the vein, without indusia.
Distribution
NW. New Guinea present
One species, known only from two collections from neighbouring localities in NW. New Guinea, one in 1875, the other in 1913.
Notes
The second collection, as illustrated in Gepp's plate above cited, shows rhizome and frond- characters exactly matching Lomariopsis, and I agree with Christensen in regarding the two genera as closely related. Possibly the sori of Thysanosoria show a stage in the evolution of the acrostichoid condition of Lomariopsis. Alternatively, Dr Hennipman suggests that the two specimens named Thysanosoria may represent an abnormal condition of a species of Lomariopsis; but the collection of identical material after an interval of nearly 40 years is against this. The similarity of the fertile pinnae of Thysanosoria to Nephrolepis was noted by Gepp; but in vegetative habit and in spores the two genera are very different.