QE REVUE BRYOLOGIQUE 
- the influence of W. crispa is seen in the reduced length of the 
_seta, the shorter capsule with its tardily dehiscing operculum, 
the reduction of the peristome and the thinner walls of the 
exothecium. 
In the case of W. crispata :< W. crispa no further reproduction 
except by apospory is possible, as well developed spores do not 
seem to occur, but it would be interesting to know what kind of 
plant would develope from the spores of the hybrid W. crispa < 
crispala, Which appear to be sound. My own attempts Lo cause 
them to germinate have failed and a careful search in the loca- 
_lities where the hybrids occur near Lewes has not revealed any 
plant whichT have reason to supect of such an origin. Hofmeister 
in reterence to the hybrids Physcomitrium pyriforme Brid. and 
. Funaria fascicularis Schp. < F. hygrometrica Sibth. records an 
experiment in which he failed to produce them artificially by 
removing the antheridial shoots from #, hygrometrica (4), but in 
he hybrids discovered in a wild state by Bayrhoffer #. hygro- 
melrica appears to have supplied the male element in both cases. 
No doubt also the mutilation was in itself prejudicial to the plant 
and according to my observations on the hybrid forms of Weisia, 
‘unnecessary, as one interesting stem which I found with a nor- 
_ male capsule of W. crispa and one of the hybrid had also a 
perfectly well developed male flower. — No doubt where the 
tufts are ‘inextricably mixed the male flower of thé hybridizing 
species may be nearer the archegones of the plant than its own 
male flowers are. ù Éd 
= Coincidence of the period of sexual maturity in the parents is 
. of course essential to successful hybridization and I imagine that 
these periods do not coincide with W. srispa and W. microstoma 
CG. M. as although [ have found the two species growing freel 
together in considerable quantities, 1 have found no traces of 
_ hybrid capsules. Fe 
= My attention has been drawn by Mr Dixon to the apparent re 
semblance between the hybrid W. crispa X W. crispata and 
Astomum  Ludovicianum Sull. and Gymnostomum phascoides 
Drum. as they are represented in à copy of Drummond’s Musci 
_ Americani at Kew, which belonged to the late Mr Wilson. On a 
_closer examination, however, of the species I do not feel satisfied 
as to the identity of either of them with the hybrid and since 
W. crispala does not appear to occur in the United States, 
« 
(1) Hofmeister on the Higher Cryptogamia, translated by F. Curre: R ÿ 
Society 1862 p. 481. PS D 
