Mosses of Eastern Massachusetts. 183 
tab. 18. fig. 1-5. Brid. Bry. Univ. II. p. 179. Brid. Meth. 
p. 127, &c. On apple trees, Chelmsford! On Elms; Hing- 
ham! Found also at Ipswich, by Mr. Oakes! (Its habit is 
densely czxespitose, with surculi irregularly extending outwards, 
and bearing short, upright branches.) Fruit in December. 
Pt. hirtellum. Hedw. Sp. Musc. p. 83, tab. 17, fig. 6. 
Brid. Bry. Univ. II. p. 188, &c. Synonym. Pterigonium 
hirtellum. Schwaégr. Suppl. p. 108. Investing the bottoms 
of trunks of trees with a dense, green layer, elegantly extend- 
ing itself upwards in feathery surculi, and generally abundant 
in fruit; in which state, after the fall of the operculum, may 
be easily seen the white teeth of the peristome, singularly co- 
hering at their tips. Common. : 
Levcopon brachypus. Brid. Bry. Univ. II. p. 210. From 
collections of B. D. Greene, under the name of Leucodon 
eviselum, and gathered by him in Tewksbury! Also from 
Ipswich, Oakes ! 
DIPLOPERISTOMI. 
(With double peristomes.) 
A. Interior peristome with free ciliæ. 
Neckera pennata. Hedw. Sp. Musc. p. 200. . Br. FI. II. 
p. Tl. Muscol. Brit. Suppl. Tab. 4. On trunks of birch and 
of some other trees, Hingham! abundant at Hubbardston ! 
also Ipswich, Oakes ! our 
N. cladorhizans. Hedw. Sp. Musc. p. 207, tab. 47, fig- 
Ii. M'x. Fl. Bor. Am. II. pp. 307, 308. In the shade. 
Chelmsford ! ere 
N. seductrix. Hedw. Sp. Musc. p. 208, tab. 41, fig. 8-13. 
. 
Brid. Meth, p. 138, Near the roots of trees, Chelmsford! . 
P- Interior peristome consisting. of a reticulated, conical 
membrane. 
Foxrıvatts antipyretica. (Linn.) Muscol. Brit. p. 140, 
22. Dill Musc. 33, fig. 1. Brid, Bry. Univ. II. p. 655. 
