. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. lant are entire) ; costa extend-ing well into the acumen; cells of leaf very long and narrow; basal shorter,often colored; alar varying greatly; somewhat decurrent and enlarged, oftenwith the lower row more abruptly enlarged and differentiated than is shown inPlate LXXII; perichaetial leaves long, erect and sheathing: autoicous; sporesmature from spring to summer. PJasily recognized with a hand-lens by meansof the italicized characters. Var. plumulosus (B. & S.) Roth
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. lant are entire) ; costa extend-ing well into the acumen; cells of leaf very long and narrow; basal shorter,often colored; alar varying greatly; somewhat decurrent and enlarged, oftenwith the lower row more abruptly enlarged and differentiated than is shown inPlate LXXII; perichaetial leaves long, erect and sheathing: autoicous; sporesmature from spring to summer. PJasily recognized with a hand-lens by meansof the italicized characters. Var. plumulosus (B. & S.) Roth is a very slender closely pinnate form withshorter pointed, less denticulate leaves ; seta shorter and capsule smaller; frequent. D. fluitans (Dill.) Warnst. (including subspecies and varieties). This isfairly common in swamps and is frequently found floating in pools. All formsare characterized by denticulate, non-striate leaves. Some of the leaves of a plantmay be entire but some are sure to be denticulate, especially at apex. Some ofthe leaves of the subspecies exannulatus and its varieties may be slightly striate,. PLATE LXXII. Drepanocladus uncinatus (From Bry. Eur.) HYPNACEAE 309 but never so much so as to lead to confusion with the other species. With fewexceptions the leaves at the end of stems and branches are falcate-secund butare often straight below, all very long acuminate (except some varieties ofexaiiiiii/iilHs ), decurrent; costa long, extending into the apex or very rarelysomewhat excurrent; leaf cells very long and narrow, more or less inflated atthe angles; capsules without annulus. KEY TO SUBSPECIES AND VARIETIES 1. Alar cells abruptly enlarged and inflated, forming conspicuous auricles reaching nearly to the costa and arranged in a regular series; costa reaching well toward apex ; nearly always dioicous exaiinutatus, 2. Alar cells differentiated but not so much enlarged and not in a series ; costa shorter as a rule ; autoicous fluilaiu, 3. 2. Leaves very lo
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