 zation, that I found tufts of W. crispa with a considerable numbe 
of conspicuous bright chesnut-brown capsules on setæ which. 
_ raised them almost above the perichætial leaves and which con: 
_trasted strikingly with the dull olive green immersed capsules ot 1 
the typical plant. F was fortunate enough in examining these 
tufts to find à single stem with three capsules, two of which 
were perfectiy normal W. crispa, while the third had the form of 
the hybrid and [ have since found two similar stems in different 
localities. Near by these capsules, though less frequent, and 
_ growing on the vegetative plant of W. crispata, were a few pale 
_elongate empty capsules on setæ somewhat variable in length, 
but always shorter than those of typical W. crispata, which FE 
believe to be the result of archegones of W, crispala, fertilized 
by the antherozoids of W, crispa. : : 
The evidence of the hybrid origin of these latter capsules is 
- possibly less conclusive than it is of the capsules of W, crispa X 
 W crispata, but 1 do not think that it admits of much doubt, as 
it will be seen from the diagnosis given below that the characters 
_of the capsules are intermediate between the two spécies and 
Such capsules were only found intermixed tufts of the two 
. plants or at least where they were growing in the elosest proxi 
_ mity. [ believe therefore that the {wu forms of capsule afford a 
good example of reciprocal hybridity, which appears to be rare 
among mosses, though Herr G. Roth in his Europaïsche Laub 
. moose (Vol. I, p. 278) records a similar case of reciprocity in 
_Leplotrichum astomoides (Limp.). The following are short dia 
_ gnoses of the two hybrids. nn 
 Weisia crispa Milt. o X W. crispata Ldb &, — The vegeta- 
_tive plant is that of W. crispa and the inflorescence is the same 
as in that species. The capsule is shortly oval bright chesnut- 
brown with a smooth polished surface from 4 to 4,15 mm. long 
with the opereulum and 0,65 to 0,70 mm. broad on a short colour- 
_less seta (1,45 to 4,55 mm. long,) which elevates it almost above 
the perichætial leaves : Operculum about 0,45 mm. long, déhis- 
_ cing when mature : Calyptra rather large : Cells of the exothecium 
. Shortly reclangular or subquadrate, slightly more elongate below 
rather thin-walled, 0,045 to 0,055 mm. long by 0,025 to 0,045 mm 
broad. The cell walls are slightly thicker than those of W. crispa 
. but not so incrassate as those of W. crispata and, though here and 
there more elongate, they are mostly subquadrate, : Thoug 
they have less tendeney to be collenchymatous, they more elosely 
. resemble those of W. crispa than those of W. crispata : Siomata 
= few, poorly developed, at the base of the capsule only: Peristom: 
