. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. nar-rowed to the mouth but not contracted beneath it. The cut gives an excellent idea of the progressive changes in the all the forms illustrated may be found in the same tuft. This spe-cies is occasionally found on rocks. The spores mature in summer. U. Americana (Beauv.) Lindb., the AmericanUlota, grows exclusively on rocks. Its leaves arerigid when dry like those of Ortholncbtim, notcrisped as in the two tree-growing species; thecapsules very clo
. Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States. nar-rowed to the mouth but not contracted beneath it. The cut gives an excellent idea of the progressive changes in the all the forms illustrated may be found in the same tuft. This spe-cies is occasionally found on rocks. The spores mature in summer. U. Americana (Beauv.) Lindb., the AmericanUlota, grows exclusively on rocks. Its leaves arerigid when dry like those of Ortholncbtim, notcrisped as in the two tree-growing species; thecapsules very closely resemble those of theCrisped Ulota, except that the seta is markedlylonger. It is most likely to be confused withOrthotricbum aiiomaliiui. For- distinctions, seeunder that species. All of these species of UloUiexcept Bruchii are common in the hilly portionsof our range, and the tree-growing species withOrthotrichtim furnish good collecting for winterand early spring, when most other plants areburied under snow. ORTHOTRICHUM Hedw. Plants comparatively short-stemmed, in closerounded cushions, sometimes looser, on trees. Figure capsules of VIota progressive changes due to in-creasing age. (From Br). Eur.) ORTHOTRICHACEAE 179 everywhere, and more rarely on rocks. Leaves hygroscopic, imbricated whendry and not greatly curled or twisted, which character separates the genusfrom Ulota except U. Jmcricana. Upper leaf cells usually papillose, thick-walled, the lower thinner-walled and quadrate to rectangular. Calyptra sparselyhairy or naked. Base of seta enclosed in a minute cup-like sheath, the immersed or emergent, rarely exserted ; usually with 8 regular folds,or plicas, when dry, but sometimes smooth or with 16 plicae. Peristome usuallydouble, with 16 broadly lanceolate teeth, which are usually united in pairs. Innerperistome of 8-16 narrow segments, often called cilia. The paired (bigemmi-nate) teeth and degenerate inner peristome illustr
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