184 John Lewis Russell on the 
Rivers’; streams ; brooks, Common. Seldom found with fruit. 
Larger than the European co-species in length of stem and 
breadth of foliage. Hingham! Chelmsford! also Marshfield, 
Dr. Porter! 
F. squamosa. .(Linn.)  Muscol Brit. l. c. Brid. Bry. 
Univ. II. p. 657. A smaller, flat-leaved species. Western 
part of the State, Dr. Porter! Also, found abundant in 
brooks at Hingham ! 
F. capillacea. (Dickson.) . Muscol. Brit. p. 142, tab. 22, 
Br. Fl. p. 74. Dill. Musc. tab. 33, fig. 5.  Brid. Bry. Univ. 
Il. p. 660. Hingham! Also from Dr. Porter ! 
F. subulata. (Pal.de Beauv.) Brid. Meth. p. 186. — Bry. 
Univ. II. p. 661. Hanging on bushes, principally the Ce- 
phalanthus occidentalis, Linn., in partially desiccated mill- 
ponds, and full of fruit in November, Chelmsford ! also, in 
similar situations, Hingham! Obs. ‘The occasional depriva- 
tion of water seems necessary to produce fructification in 
species of mosses whose habitat is in streams. 
c. Exterior peristome, consisting of sixteen lanceolate, 
linear, acute teeth, bent inward; interior, of a membrane 
split to the base into as many cilia, which are frequently 
connected by transverse bars. 
- Curmacium Americanum. (Rich'd.) Brid. Sp. Musc. II. 
p. 45. —Bry. Univ. II. p. 273. A beautiful, tree-like moss, 
and not uncommon. Hingham! Chelmsford! Waltham! 
Also Ipswich, Oakes ! 
pn. Exterior peristome, consisting of sixteen subulate teeth, 
bent inward ; interior, of a membrane split into sixteen linear, 
equal cili, or processes. 
Lzskra compressa. Hedw. Sp. Muse. p. 231, tab. 56, 
fig. 1-7. Brid. Meth. p. 141. — Bry. Univ. II. p. 287. On 
the ground, and at roots of trees. Plymouth! Hingham! 
Ipswich ! 
- L. acuminata. Hedw. Sp. Musc. p. 224, tab. 56, fig- 
14-18, Brid. Meth. p. 144. — Bry. Univ. II. p. 296. | 
