1903] ODON7 OSCHISMA MACOUNII AND ITS ALLIES 323 
Closely related to O. Macounii, but differing from it in several 
important respects, is a peculiar Odontoschisma which was col- 
lected by Miss Gertrude Gibbs at Port Renfrew, Vancouver 
Island, in 1901. This species is apparently undescribed and 
may be designated O. Giddsiae in honor of its discoverer. The 
specimens are without sexual organs, but show well a a 
gemmiparous branches. 
Two other members of the genus, O. denudatum and O. Sphagni, 
have been recorded from North America, north of Mexico. Both 
of these species have long been known in Europe, and O. denuda- 
tum has been reported from Siberia and from Japan. The range 
of this species in North America extends from Greenland to 
Louisiana, with a doubtful extension into the tropics. Accord- 
ing to printed reports, the range of O. Sphagni is even more 
extensive, but a comparison of authentic European material with 
American specimens which have been determined as O. Sphagni 
shows that the majority of the latter are really referable to 0. 
prostratum, a species originally described from Jamaica. In fact, 
I have seen no specimens whatever of true O. Sphagnit from the 
United States, although the species occurs in Canada. Mitten 
reports” QO. prostratum from Bermuda, and says that it also 
occurs in Europe, but the latter statement does not appear to be 
confirmed by any other European writer. In addition to Jamaica, 
O. prostratum has been reported from several localities in tropical 
America. 
A careful study of these five species makes it evident that 
certain of the generic characters commonly accepted for Odon- 
toschisma do not apply to all of the species, and that the genus 
as a whole is about as closely related to the monotypic Anomo- 
clada, of South America, as it is to Cephalozia, with which 
it is commonly associated. 
Odontoschisma was first proposed by Dumortier, in 1831,% 
as a section of his genus Pleuroschisma. This included also, as 
sections, Lepidozia and Pleuroschismotypus, the latter being 
essentially the same as Bazzania. In 1835 %+ he raised all three 
“Challenger Rept. Botany 17:92. 1884. 
*SSyll. Jung. 68. 1831. ™ Recueil d’Obs. sur les Jung. 19. 1835- 
