MUSCI. (MOSSES.) (29) 629 
oblong or cylindrical, annulate, long-pedicellate. Peristome single: teeth 16, 
linear-lanceolate, more or less cloven and perfora ted. Inflorescence monecious. 
— Alpine species, growing upon moist rocks ; stems ere cxspitose, dichoto- 
mously branched, with distichous and subulate-setaceous costate leaves, of an 
areolation dense roundish above, enlarged Siaphiaae ous " ow. (Name from 
Siorixos, two-ranked, referring to the leaves.) 
1. D. capillaceum, Br. & Sch. Stems 1/-2! high; leaves abruptly 
long-subulate from a dilated sheathing base, spreading, flexuose, the costa per- 
current ; capsule subcylindrical, erect ; antheridia axillary, naked. — Northern 
shore of Lake Superior, Agassiz. (Tab. II.) (Eu.) 
2. D. inclinatum, Br. & Sch. Not so tall as the last; leaves more 
crowded and narrower, the perichetial ones 3-ranked ; capsule cernuous, oval ; 
antheridia with perigonial leaves. — Northern shore of Lake Superior, Agas- 
24. EUSTICHIUM, Bryol. Europ. (Tab. IL) 
- Norvégicum, Bryol. Europ. Stems frond-like, flat, mostly sim- 
ple isons 1/ long and 1” broad), rooting only at the bulb-like base; leaves 2- 
ranked, complicate, closely imbricating, erect; those on the middle of the stem 
elongated-oblong, obliquely truncate, shortly acuminate, increasing in size as 
they ascend ; the perichetial leaves attenuated into a long and linear, flexuous, 
pellucid, flat, tear and slightly serrulate point longer than the lamina ; are- 
olation above subrotund, below oblong, that of the point of the pericheetial 
leaves linear; costa peccarrent, se upper part narrowly winged : dicecious ; flow- 
ers of kinds al: fi unknown. — Pendent on the ndi 
faces of sandstone rocks, six miles south of Lancaster, Fairfield County, Ohio 
only other certain habitat recorded for this very inte oss is I 
n 
to Fissidens. (Sulliv. in Mem. Amer. Acad. n. ser. 3. p. 57. t.1.) (Tab. 
Trisnze IX. POTTIEA. 
25. POTTIA, Ebr. (Tab. IL) 
Calyptra cuculliform. Operculum depressed-conic,. more or less rostrate. 
Capsule obovate-truncate or oval-oblong, exserted or immersed. Peristome 
nfloresce ceci 
areolation, sr ats at the base. (Named in memory of Professor J. F. 
Pott, a German bota: 
. P. tru asta. Br. & Sch. Stems 2/’- fh _—_ regacions, simple or 
bt leaves obovate-lanceolate, mucronate b 
, truncate; operculum Sere Se rostrate. pheed eustoma, Eirh. Gym- 
teesthence truncatulum, Hedw.) — evens, New ——_ 
vania. (Tab. II.) (Eu.) 
53* 
