. The Bryologist. Bryology; Bryology -- Periodicals. 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 mi

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. The Bryologist. Bryology; Bryology -- Periodicals. 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) A Apical cells of branch leaves with a single terminal papilla (Fig. 2, c); median cells as in A. Paraphyllia numeros, branched B Apical cells of branch leaves not papillose; median leaf cells linear- rhomoboidal (Fig. 10). Paraphyllia long linear or filamentose (Fig. 3, c).. .C. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of th