254 A MANUAL OF MOSSES 



less pellucid, oval to oblong-hexagonal, with one papilla over 

 the lumen, the alar quadrate; brartch-leaves narrower at the 

 base, shorter-pointed, plane-margined, more or less distinctly 

 serrate; costa shorter, cells mostly opaque; inner perichstial 

 leaves erect, pale, plicate, from a lanceolate or linear base long- 

 acuminate, incompletely costate: seta 1.5-2.5 cm. long, red- 

 castaneous, smooth; capsule inclined, oblong-cylindric, drying 

 more or less horizontal and arcuate, when old and empty con- 

 tracted below the mouth; annulus present; peristome-teeth 

 lance-subulate, yellow, bordered, transversely-striate, dorsally 

 lamellate; inner peristome yellowish, the basal membrane 

 wide and carinate, the segments lance-subulate, of same length 

 as teeth, carinate, entire or narrowly split, ciHa complete, 2 or 

 3, slender, nodose or appendiculate ; lid convex-conic; acute; 

 calyptra cucullate; spores .008^.012 mm. 



A genus of nearly 50 species, mostly occurring in eastern 

 Asia and in South America ; only the following in our region i 



Key to the Species. 



a. Stem-leaves rounded-ovate, short-acuminate. 



1. H. virginianum. 

 a; Stem-leaves ovate, more or less long-acuminate. 



2. H. microphyllum. 



1. Haplocladium virginianum (Bridel) Brotherus. 

 (Thiiidium virginianum Lindberg; T. gracile var. lancastricnse 

 Cardot ; Hypnum gracile var. lancastriense Sullivant and Les- 

 quereux). 



(Plate XXXV) 



Small to medium-sized, appressed-cespitose, dark to dirty 

 green: stems diffusely divided, the branches short and erect 

 or ascending; leaves of the: stems rounded-ovate, concave, 

 narrowed to the base but scarcely decurrent, about 0.6-0.8 mm. 

 long, abruptly acuminate, costate into the acumen, serrulate 

 above, erose-dentate below, appressed when dry, loose when 

 moist; median leaf-cells quadrate-hexagonal, uni-papillate, 

 rather incrassate, the lower marginal more or less transverse- 

 ly oblong-quadrate or hexagonal ; branch-leaves about 0.4-0.6 

 mm. long, broadly and shortly acuminate with a serrttlate mar- 

 gin above; perichaetial leaves long, pale, up to 2.5 mm. long: 

 seta slender, about 2-2.5 cm. long, rather richly castaneous, 

 dextrorse; capsule oblong-cylindric, castaneous, curved, more 

 or less horizontal, often when old more or less pendent by the 

 curving of the upper part of the seta, the urn about 2.5 :1, 

 about 2 mm. long, constricted below the mouth when dry and 

 empty; lid obtusely short-beaked, about one-third as long as 

 the urn; peristome normally hypnoid, yellowish, the 16 teeth 

 lance-linear, dorsally cross-striate, with zigzag divisural line, 

 distinct dorsal lamellae, and about 35-40 closely placed tra- 



