. Mousses avec lentille à main et microscope : un manuel non technique des mousses les plus communes du nord-est des États-Unis. Règle, pas largement répandu; feuilles de tiges o ate-lancéolate, long-acuminate, atteignant 1,2x0,4, mais usuallysmaller, feuilles de branches plus petites et lancéolées, les deux à l'ensemble, narrowedat légèrement décurrent; costa mince, atteignant le milieu du fème; feuille ou un peu plus loin; cellules médianes des feuilles oblong-hexagonal à hexagono- 330 MOSSKS AVEC MAIN-LKNS AM) MKROSCOPE rhomboïdal, 3-4:1, plus large et subrectanguiar vers la base, quadrate totransverely el

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. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. rule, not widely spreading; stemleaves o ate-lanceolate, long-acuminate, reaching 1.2x0.4, but usuallysmaller, branch leaves smaller and lanceolate, both serrulate to entire, narrowedat the insertion and slightly decurrent; costa slender, reaching to the middle ofth; leaf or somewhat farther; median leaf cells oblong-hexagonal to hexagono- 330 MOSSKS WITH HAND-LKNS AM) MKROSCOPE rhomboidal, 3-4:1, broader and subrectanguiar toward the base, quadrate totransversely eloiii^ate at the basal margin: autoicous; seta 15-30 long; capsulecylindric, curved and cernuous, contracted below the mouth when dry andempty; annulus of 2-3 rows of cells; spores in spring. Common on moist substrata, ground, stones and especially decaying wood-Very variable in si/e; several European varieties are described. We have var.tenue (Schrad.) B. & S., which is so distinct as to merit notice. It is exceed-ingly slender, filiform; leaves distant, shorter and smaller;seta short, capsule small, nearly straight.. Figure 171. Amblyslegium serpens. (From Bry. Eiir.) i and 2. Plant natural size. 27 to 32. Capsules. 6band jb. Leaves. The angular cells are usually shorter, and some are broader than long. The short, broad leaf cells distinguish./, serpens from mosses of other generathat may resemble it superficially. Small forms of J. variiim with costa notquite percurrent and large forms of serpens approach each other, but I havenever seen serpens with the costa as long and strong as in variiim. A. Juratzkanum Schimp. is, in my opinion, a large variety of serpens, with somenondescript forms included by various authors. Exceedingly variable in size, ranging from forms the size of serpens to those difficult to distinguish fromKochii. Leaves larger than in serpens, nidely spreading both ivet and dry, narrowly long-acuminate, more or less serrulate; cells of the basal marginsrectangu

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