. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. MOSSES WITH A HAND-LENS 155 â ^ .jrj^ in length; spores light yellowish-brown, jfjh,"" maturing in autumn. Widely distributed IS^ I "^^f l""' apparently not abundant. '^J.\'^Y '^'^^ Horned Liverworts are the highest "^Jhj^^ of the Bryophyta and by many are consid- ^l-'%-.::M\ ^y^^ as the ancestors of the Perns, but they ySx'x^M I ^I'E P^it here for convenience, as they are ir\I sure to be sought with the other thalloi
. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. MOSSES WITH A HAND-LENS 155 â ^ .jrj^ in length; spores light yellowish-brown, jfjh,"" maturing in autumn. Widely distributed IS^ I "^^f l""' apparently not abundant. '^J.\'^Y '^'^^ Horned Liverworts are the highest "^Jhj^^ of the Bryophyta and by many are consid- ^l-'%-.::M\ ^y^^ as the ancestors of the Perns, but they ySx'x^M I ^I'E P^it here for convenience, as they are ir\I sure to be sought with the other thalloid /// /s^' /} hepatics. MARCHANTIACEAE. The True Liverworts* Figure 78, No- '^^^ plants of this family consist of a tothylas orhicurlaris thallus of medium to large size, one-half to (After Sullivant.) gix inches in length, usually branching dichotomoLisly but sometimes with more than two branches at a fork. They are attached to the substratum by numerous roothairs and are thickened in the middle to form a midrib. This in some cases is not very apparent above but shows plainly underneath. The upper surface is covered with small pores (stomata) which are very apparent with a lens^ except in Reboulia. The capsules are spherical or ovoid and open irregularly by imperfect valves or by a portion of the top coming off after the manner of a lid. In this family the capsules and usually the antheridia are borne on special long-stalked receptacles well illustrated by the familiar Marchantia. KEY TO THE GENERA. 1. Sterile stems bearing abundant gemmae in shallow open receptacles. .2 Sterile stems without gemmae 3 2. Found only in and around greenhouses; gemmae in crescent- shaped receptacles; never fruiting in our region Lunularia. Growing abundantly everywhere; gemmze in cup-shaped re- ceptacles; capsule-bearing receptacles with 7 to 11 conspicuous rays Marchantia- 3. Thallus large; 2 to 6 inches long and yi inch or more wide, dis- tinctly areolate as in Marchantia, but areolae larger a
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmosses, bookyear1905
