. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. mSulliv. Icones x Yz- so that the (ilantsin I are 2 natural size.) E. crassinervium is rather the largest species with less pronounced teeth onthe surface, while in E. spinttlosum that portion of the leaves above the capsuleis little but a strongly toothed costa, reminding one of the excurrent costain ^Dicraiium icoparinm, only on a much smaller scale. This species is apparentlymore addicted to swamps than the others, which grow on moist soil in vari-ous situations. E
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. mSulliv. Icones x Yz- so that the (ilantsin I are 2 natural size.) E. crassinervium is rather the largest species with less pronounced teeth onthe surface, while in E. spinttlosum that portion of the leaves above the capsuleis little but a strongly toothed costa, reminding one of the excurrent costain ^Dicraiium icoparinm, only on a much smaller scale. This species is apparentlymore addicted to swamps than the others, which grow on moist soil in vari-ous situations. E. sessile (B. and S.) C. Miill. has leaves tapering more uniformly thanthose of the crassinervium group and almost entire, so that there is littledanger of confusing it with them. EPHEMERACEAE 133 ACAULON C. MUll. The species of this genus are distinguished by their broadly ovate looselyareolate smooth costate leaves, spherical capsule almost without apiculus;with leaf-cells (as well as leaves) broader and proportionately shorter than inEphemerum, but growing in the same situations. The time of fruiting is inearly Irtjiirlntm Figure 67. Acaulon tri<juetrum (From Bry. Eii A. triquetrum (Spruce) C. Miill. has the margins of the upper leaves re-flexed and the characters indicated above and is otherwise well described bythe illustrations. It is widely distributed, but is rather less common than thenext. A. rufescens Jaeg. is distinguished by its rounder less conspicuously three-cornered form and the terminal leaves with plane margins. Both the above species are distinguished from ^/. muliciim, a European andwest-coast species, by the squarrose leaf-apiculus of most of their leaves, asshown in the figure. Phascum Floerkianum W. and M., a very rare plant, closely resembles 134 MOSSES WITH HAND-LENS AND MICROSCOPE the species of Acaulou, but has the leaves papillose above on both sides, andan apiculate capsule. Physcomitrella patens (Hedw.) B. and S. differs from Acaulon c
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