MOSSES WITH A HAND-LENS lOJ 



slender hair-like leaves. The capsules mature in June and July. 



Some species of Pohlia have very long-necked capsules, but 

 the leaves are so much wider that there is no need of confusing 

 them with the Long-necked Bryum. 



This species is frequent on moist shaded cliffs and on rocks 

 near water. It is not as rare as the author once thought, for it 

 is frequent on damp mortared walls in various situations. The 

 author has collected it on the basement of his Brooklyn house 

 and in the cut which leads up to Montague Street from the 

 Brooklyn end of the Wall Street Ferry. 



MNIUM. 



The Mniums are closely related to the Bryums, but in habit 

 and general appearance are different enough so that they can 

 usually be distinguished without difficulty. As a rule, the plants 

 are larger and broader. The Giant Bryum, however, looks very 

 much like the Mniums. 



There are numerous species of Mnium, many of them com- 

 mon. We have about ten that are common enough and suffi- 

 ciently well characterized to warrant description here. 



KEY. 



1 . Leaves margined 2. 



Leaves not margined 1 1. 



2. Leaves entire 3. 



Leaves serrate 4. 



3. Growing on rocks in the bed of brooks punctatum. 



Growing on soil in shaded swampy places punctatum elatum. 



.4 Capsules clustered 8. 



Capsules single 5. 



5. Leaves serrate to base affine ciliare. 



Base of leaves entire 6. 



6. Leaves oblong-lanceolate, 5:1 hornum. 



Leaves oblong, rounded, or obovate 7. 



7. Mouth of capsule (peristome) red spinulosum. 



Mouth of capsule not red sylvaticum. 



8. Leaves tapering to the acute apex 9. 



Leaves obtuse and rounded at apex, mucronate by the excur- 



rent costa rostratum. 



g. Teeth at margins of leaf double; peristome red spinulosum. 



Teeth at margin of leaf not double; peristome not red 10. 



10. Plants dioicous, with stolons affine. 



Antheridia present at base of seta; stolons lacking Drummondii. 



n. Plants very large resembling large forms of the Large- 

 leaved Mnium cinclidioides. 



Plants small stellare. 



M. SYLVATICUM Lindb., Woodsy Mnium. One of the first 

 signs of vegetable life in early spring is the array of upright green 

 sporophytes of the Woodsy Mnium, which is common in lawns 

 and parks in moist shady corners, and is to be found abundantly 



