. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. ur valves after the manner of the HepaticjE, the valves remaining coherentat the apex; also by the absence of any air cavity between the capsule wallsand the spore sac. Family 2. Adreaeaceae The only family of the order. Mosses of alpine or subigrowing upon granitic or slaty rocks; withthe habit and appearance of Giiinmici. Theappearance is always dark, sometimes black,and the leaves are very brittle and so densethat they need to be soaked in a solution ofcaustic pota
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. ur valves after the manner of the HepaticjE, the valves remaining coherentat the apex; also by the absence of any air cavity between the capsule wallsand the spore sac. Family 2. Adreaeaceae The only family of the order. Mosses of alpine or subigrowing upon granitic or slaty rocks; withthe habit and appearance of Giiinmici. Theappearance is always dark, sometimes black,and the leaves are very brittle and so densethat they need to be soaked in a solution ofcaustic potash for a few moments, in order tomake their structure apparent under the mi-croscope. The presence of chlorophyll in theleaves is not apparent except in veryyoung leaves. There is very little dif-ference in the sporophyte in the different species. ANDRE/EA Ehrh. The Only Genus of the Family A. petrophila Ehrh. is common on exposedrocks in the moun-tains of our is easily dis-tinguished from anyspecies of Grimmiaor byits lack of a costa,and it is muchmore slender thanHediii^id, and uith- dpine , leaf sections 1 Rolliii. (Bry. Eur.), and arcolation. S6 MOSSES WITH HAND-LENS AND MICROSCOPE out hyaline points to leaves. The other points in its structure are best madeout from the illustration. A. Rothii W. & M. {A. nipcstrh of many authors) occurs with the pre-ceding and occasionally descends to lower levels on exposed rocks. It hasbeen found along the Hudson, at Yonkers. It is easily distinguished fromA. pelnphild by the strong costa reaching to the apex of the leaf, or beyond.
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