MUSCI. (MOSSES.) 29 
blong or Lega eH 92 aR eames single: isa * 
linear-lanceolate, more or less cloven and perforated. Infl 
— Alpine s ee growing upon moist rocks ; stems densely czspitose, dichoto- 
mously branched, with distichous al subulate-setaceous costate leaves, of an 
areolation dense roundish above, ey diaphanous sion (Name from 
dierixos, two-raniced, referring to the leaves.) 
1. D. capillaceum, Br. & Sch. Stems 1/-2! high; leaves eek 
long-subulate from a dilated sheathing base, spreading, flexuose, the co 
current ; capsule subcylindrical, erect ; antheridia axillary, naked. Neale 
shore of Lake Superior, Agassiz. (Tab.16.) (Eu.) 
2. D. inclinatam, Br. & Sch. Not so tall as the last; leaves more 
d and narrower, the perichetial ones 3-ranked ; capsule cernuous, oval ; 
anterd with perigonial leaves. — Northern shore of oe Superior, Agas- 
24. EUSTICHIUM, Bryol. Europ. (Tab. 16.) 
1. E. Norvégicum, Bryol. Europ. Stems spent flat, mostly sim- 
ve (about 1! long and 1” broad), rooting only at the bulb-like base; leaves 2- 
sed, complicate, closely imbricating, erect ; those on the midale of the stem 
socsinds chad: obliquely truncate, shortly acuminate, increasing in size as 
they ascend ; the perichzetial leaves attenuated into a long and linear, oe 
pellucid, flat, equitant, and slightly serrulate point longer than the lam 
olation above subrotund, below oblong, that of the point of a6 perichati 
cos 
h kinds terminal: fruit unknown.— Pendent on the perpendicular 
faces of sandstone rocks, six miles south of Lancaster, Fairfield iy Ohio. 
— The only other certain habitat recorded for this very interesting Moss is Ice- 
land. That of Norway is apparently a mistake. — It is probably das _ 
to Fissidens. (Sulliv. in Mem. Amer. Acad. n. ser. 3. p. 57. t. 1.) (Tab. 16 
Tre IX. POTTIEA. 
5. POTTIA, Ebrh. (Tab. 16.) 
Calyptra cuculliform. Operculum depressed-conic, more or less rostrate. 
ct obovate-truncate or oval-oblong, exserted or immersed. Peri 
cence moncecious: male cae! axillary. — Small annual or 
biennial aioe growing on newly exposed soil, with entire ovate-oblong or 
obovate-lanceolate and rather broadly costate satin of a ee or rectan- 
gular eeealevenaate enlarged at the base. (Named in memory of Professor dF 
botanist.) 
1. Pataca, Br. & Sch. Stems 2-4" high, gregarious, simple or 
ed 
nostomum truncatulum, Hedw.) — On the ground, New England and veut 
vania. (Tab.16.) (Eu.) 
«58% 
