s ’ $ 
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; és. cone L. Brit. Jung. t. 81. Dill. Muse. 
t. i. 72, fig. 26. Schw. p. 14. Mass. Catal. On mossy 
rocks, and also decayed pieces of wood, Chelms- 
ford! A deliato species, closely adhering to the 
substance on which it grows. Hooker and Schwein- 
itz remark, that its habitat is “ the bark of trees.” I 
have generally found it on mossy rocks. Gemme 
may be frequently seen on the edges of the leaves. 
J. bidentata, L. Brit. Jung. t. 30. Dill. Musc. 
t. 72, fig. 11. Schw. p. 17. In very moist situa- 
tions among Hypna near a spring. Chelmsford! If 
the specimen is examined by the naked eye only, 
each leaf seems to have three teeth; a deception 
arising from the overlapping of one leaf on the next. 
I am inclined to suppose this identical with J. triden- 
tate of the Mass. Catalogue “Schw. Dr. Porter,” 
which, as a species, I can € find described. 
J. trilobata, L. ` Brit. Jung. t. 76. Schw. p. 12. 
. Mass. Catal. | Among ined and other mosses. 
Chelmsford! Plymouth! From the axilla, of the 
stipules proceed numerous flagelle, which serve as 
an excellent guide to distinguish the species. In 
* Muhlenberg’s Catalogue,” it is called J. radicans, 
probably on account of this feature. | 
J. platyphylla, L. Brit. Jung. t. 40 & Suppl. t. 3. 
Schw. p. 9. Mass. Catal. Chelmsford! This is by 
far the most common species we have, and, owing to 
its great size, is most observed. Although Schwein- 
itz mentions its habitat as “on the bark of trees, es- 
ly Carpinus,” yet I have seen it abundant on 
tocks: Its dark green branching stems are most con- 
spieuous in moist weather, investing the trunks of 
s H epatic Mosses of Massachusetts. 46T € 
