. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. HYPNACEAE 283 when dry^ somewhat narrowed at base and often asymmetrical; median cellslinear, 8-12:1, basal broader and shorter, alar quadrate and more densely rilledthan in most other species and thus appearing more opaque; stem leaves nar-rowly triangular-ovate to broadly ovate, acuminate, more loosely areolate, serrateto nearly entire above; monoicous; rough ^i/>ove, nearly smooth below, capsuleoblong-ovoid, by i, horizontal to suberect, somewhat unsymmetric
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. HYPNACEAE 283 when dry^ somewhat narrowed at base and often asymmetrical; median cellslinear, 8-12:1, basal broader and shorter, alar quadrate and more densely rilledthan in most other species and thus appearing more opaque; stem leaves nar-rowly triangular-ovate to broadly ovate, acuminate, more loosely areolate, serrateto nearly entire above; monoicous; rough ^i/>ove, nearly smooth below, capsuleoblong-ovoid, by i, horizontal to suberect, somewhat unsymmetric, oper-culum slenderly conical, annulus of a single row of cells. Common on rocks inand near streams and on very moist rocks in other /i/iiniafiim ?IGLKK 149. Bruihytliecium />lit/rioiu/ri (From Brv. Eur.) The seta rough only above, the densely filled alar cells and the subaquatichabitat render this species a fairly easy one to determine in spite of the widerange of variations. The leaves are often more or less falcate-secund ami theextreme variation in this direction is known as var. homomalliim. B. populeum (Hedw.) B. is; S. This is a rather slender somewhat glossymoss, dark green to yellowish green, growing chiefly on boulders, but foundalso on smaller stones and the roots and trunks of trees. The upper branchleaves are lanceolate, the loyver ovate-lanceolate with the costa extending intothe apex, serrate to nearly entire, by ^, median cells 5-8:1, stem lea\esbroadly ovate, slenderly acuminate, not striate, basal and alar cells like those ofB. plttmosum : seta rough above, nearly smooth below, annulus persistent. Commonin most localities, especially inland. The percurrent costa and partiallv smoothseta
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