. The Bryologist. Bryology; Bryology -- Periodicals. —70— colored plates, half-tones, and drawings that are both artistic and accurate, it is a delight to the eye. Containing all our species, described in a clear and interesting manner, it is a book that the amateur must have and the profes- sional will have. The illustrated key is a feature novel and invaluable ; the idea is so good that we hope to make use of it for the A. J. G. NORTH AMERICAN THUIDIUMS. Bv G. N. The Thuidiums are widely distributed and among the most common as well as the most beautiful of mosses. The stems
. The Bryologist. Bryology; Bryology -- Periodicals. —70— colored plates, half-tones, and drawings that are both artistic and accurate, it is a delight to the eye. Containing all our species, described in a clear and interesting manner, it is a book that the amateur must have and the profes- sional will have. The illustrated key is a feature novel and invaluable ; the idea is so good that we hope to make use of it for the A. J. G. NORTH AMERICAN THUIDIUMS. Bv G. N. The Thuidiums are widely distributed and among the most common as well as the most beautiful of mosses. The stems of these plants are complanately branched, pinnate, bipinnate, rarely tripinnate. In most species the branches are so closely set as to give them a plumose appearance which is some- what distinctive. Although multiform, the paraphylliaare more or less linear or filamen- tose, often divided and branched, but not foliose. The ovate-triangular stem leaves are usually papillose on both surfaces, uni- costate, the costa passing the middle. The median leaf cells vary from roundish quad- rate-hexagonal to rhombic-oblong; in two species linear-rhomboidal. The capsules. Fig. I. a, Thuidiumdelicatu- on smooth pedicels, are annulate, more or lu7n X I. b, T. scitiim x i. c, less curved. The opercula vary from conic Capsule of the same x 5. T. to rostrate; the peristomes well developed; abietini{tn x i. the endostomial band "3 the length of the teeth with segments and cilia. SYNOPSIS OF SPECIES.* *The species mentioned in Lesquereux & James' Manual of the Mosses of North America and here omitted, are as follows : Thuidium erectum is T. delicatulum ; T. calyptratum is a form of T. microphyllum ; T. Alleni is a dubious sterile form probably of T. delicatulum ; T. remotifolium is not a Thuidium and T. tamariscinum is not known from North America. Apical cells of branch leaves crowned with 2-4 papillae (Fig. 2, a and b); median cells quadrate-hexagonal to oblong-rhomboidal (Fig 5)
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