Grevilleanum Serratum: 183 
Art. XVI.—Description of the Grevilleanum Serratum, a 
new ahaa belonging to the order Musci. By Lewis C. 
K; M. and EBENEZER Emmons, M.D. Read 
“before the hiews Institute. 
GREVILLEANUM, 
GENERIC CHARACTERS. Seta terminal. Peristome dou- 
ble; outer teeth 16, broadish, acute; inner 64, subhorizontal, 
somewhat bent, free at the apex. Calypt ra glabrous, open- 
ing ely 5 base we: sheathing the neck of the cap- 
e; apex closed, acu 
This ele and distinc t genus is named in honour sad 
Dr. Robert K. Greville, of Edinburgh, author of the Flor 
Ddinemia, and one of the most distinguished muscologists of 
the present day. It can be easily recognized by the charae- 
ters above given. 'The numerous tee the inner peritamig 
are always distinct at the base, but in the young state they 
cohere slightly at the apex, where they appear to ie held to- 
gether by transverse bars, which separate as the capsule be- 
comes mature. The calyptra is closed at the top, and has a 
short gage point. Its longitudinal opening is scarcely 
more than one-third of its whole length; through w which | 
er, Sees while in a very young state. Its rms 
a sheath, which closely embraces the neck of the capsule and 
summit BE the seta. When, however, the capsule becomes 
old, the calyptra, still sheathing the seta, falls down to the 
base of the latter, and there remains among the leaves. 
G. Serratum. Stem erect, simple. Leaves linear-lanceo- 
late, acute, crisped when dry. Lid hemispheric, yellow, 
without a beak. Capsule cylindric, curved, subhorizo tal. 
Teeth of the peristome y 
Has. Rocks in shady places, a mile west of “T'rc 
Stems about an inch and a half in height, simple, bearing: 
a considerable resemblance, in habit, to a Bartramia. Leaves 
numerous, nearly half an inch in aueoe crisped and rigid. 
Seta dark chestnut brown and shining. 
Explanation of Figures.* 
A. Top of the Peristome, magnified. B, Copeile-end 
Caly ptra, magnified. C, Calyptra, magnified. D. A Leaf, 
gnified. E. Whole plant, natural size. 
* In striking off the figures, in — it was not pee Es to represent 
ain been ee shades, described in op of the pe- 
sal gaatone ¥. Gdine—cala Jight greer.— capsule a shade darker,’ 
