Musct1 Exorict.—Menziesiani. 
HYPNUM ROBUSTUM. 
Hypnum caule erecto ramoso, foliis densissime imbrica- 
tis ovato-acuminatis falcato-secundis striatis transver- 
sim rugosis, apice subserrulatis basi binervibus, seta 
breviuscula, capsula ovato-oblonga cernua. (Tas. 
CVIIL.) 
Has. In plaga occidentali Americe septentrionalis. D. Men- 
zies, 1793. 
Caulis crassus, erectus, dichotome ramosus, ramis nune iterum 
divisis. Folia aureo-flavescentia, subnitentia, densissime im- 
bricata, ovato-acuminata, falcato-secunda, subconcava, striata, 
transversim undulata, apice subserrulata, basi breviter biner- 
via, raro uninervia. Seta sesquiuncialis, rufa, glabra. Cap- 
i 
sula ovato-oblonga, cernua, fusca. 
apitiitiaes 
At first | was disposed, with Mr. Menzies, to consider this 
plant as merely a variety of H. rugulosum of Weber and Mohr; 
but upon further investigation I am induced to publish it as a 
distinct species, upon the grounds of its much larger size, its erect - 
mode of growth, its very robust habit, and its thickly crowded, 
striated, and, in almost every instance, two-nerved leaves. 
Fig. 1, sterile plant; and Fig. 2, fertile plant, nat. size. Fig. 3, 
portion of a branch. Fig. 4, 4, leaves.—magn. 
