TMK GENEllA OF MOSSES, 
45 
varied ; that of G. Gr'iffitManum being perhaps the most 
remarkable, and resembling concave fove(Z or pits, rather 
than regular cellules. G. ovatiim is worthy of notice, from 
its leaves having a mass of minute round gemmae on their 
nerve and centre. In regard to form, the leaves differ con- 
siderably ; in G. GriffitManum they are nearly round ; in 
G. ovatum ovate, with a hair-point ; in G. microstomum 
and Donianum subulate; and if Drepanophyllum of 
Richard, Hooker *, and Schw^grichen -f-, be added to 
the genus, they are sometimes falcate. They are also either 
acute or obtuse, entire, dentate or serrate, usually slightly 
concave ; but in G. involutum, they are remarkably invo- 
lute ; and in G.julaceum convolute ; their arrangement on 
the stem is in every instance imbricated; the doubtful 
DrepanopJiyllum alone having them inserted bifariously. 
In none of the species are the cauline ones destitute of a 
nerve. 
Obs. In this genus the two opposite extremities exhibit 
little in common ; yet, with the exception of Drepanophyl- 
lum, the species may be said to form an uninterrupted se- 
ries. Some bear a near affinity in general habit to other 
genera ; as, for instance, G. Griffitliianum to Splachnum, 
and G. microstomum to Weissia, &c. : such anomalies, 
however, must necessarily occur both in the embryonate 
and exembryonate tribes of vegetables. Of the above ex- 
amples, however, G. GriffitManum is not in reality so 
closely allied to Splachnum as has been by some imagined ; 
the reticulation of the leaves is of a very different nature, 
and the thick carnose seta is totally at variance with that 
genus. 
Musci Exotici, tab. 145. 
t Sp. Muse. Supp. 2> tab. 125, 
