Jennings: Manual of Mosses — 8. Orthotrichaceae 103 



2. Drummondia Hooker 



Autoicous or dioicous: slender, in low, dense, green, scarcely shining, often 

 extensive mats: stem long, creeping, brown-radiculose, thickly covered with 

 short, erect, simple or furcate branches; leaves when dry stiffly appressed, when 

 moist erect-spreading to spreading, ovate-lanceolate to linear-oblong, acute or 

 obtuse, entire; costa strong, almost percurrent; cells uniformly rounded, smooth, 

 chlorophyllose: seta erect, long; capsule erect, symmetric, oval, smooth, when 

 dry shriveled; annulus none; peristome simple, inserted below urn-mouth; teeth 

 16, very short, truncate, entire, smooth, densely trabeculate; spores very large 

 (.08-. 10 mm); round or oval, several-celled, green, smoothish; operculum 

 obliquely rostrate; calyptra cucullate, large. 



A small genus of 7 species, on trees, rarely on rocks; mostly Asiatic, one 

 in our region. 



1. Drummondia prorepens [Bridel] Jennings 



(Anodontiitm prorepens Bridel; Gymnoslomurn proreper^s Hedwig; Hypnum 

 clavellatum DiUenius; Orthotrtchuin clavellatum Hooker) 



Plate XVIII 



Stems creeping, radiculose on the under side, with numerous short, erect 

 branches, 6-10 mm, forming dark green or blackish tufts: leaves erect to 

 spreading, oblong to ovate-lanceolate, 1 to 1.5 mm long, obtuse to acute, con- 

 cave, carinate, firm; costa strong, almost percurrent; cells small, thick-walled, 

 rounded; the alar often quadrate-inflated and hyaline in the stem-leaves, the 

 whole lower fourth of the perichaetial leaves elongate-rectangular and hyaline: 

 seta erect, about 2 5 mm. long, sinistrcrse; capsule ovate-globose, smooth, about 

 1 mm high; operculum low-conic, obliquely long- rostrate; peristome of 16 very 

 short, wide, truncate, smooth, trabeculate teeth, often more or less confluent; 

 annulus none; calyptra, at first conic, large, cucullate; spores minutely rough- 

 ened, chlorophyllose, about .080-095 mm, moderately incrassate, mature in 

 summer. 



On tree-trunks in woods, Japan, and in North America from New England 

 to Alabama, Missouri, and Ontario. 



Erie Co.: Presque Isle. May 8-9, 1906. O.E.J, (figured). McKean Co.: Quin- 

 tuple, Bradford, November 10, 1893. D.A.B. Washington Co.: Linn and Simonton. 

 (Porter's Catalogue). 



3. Orthotrichum Hedwig 

 Autoicous, rarely dioicous: cespitcse in cushions sometimes on rocks, 

 mostly on trees: stems erect and ascending, radiculose at the base, thickly 

 leaved, branched; leaves when dry never crispate but straight and appressed, 

 ovate-or linear-lanceolate, mostly acute, margins usually revolute; costa quite 

 strong, mostly not quite percurrent; basal leaf-cells rectangular to elongate, 

 pellucid to hyaline, the marginal often shorter and green: seta generally shorter 

 than the scarcely or non-sheathing perichaetial leaves; capsule oval to cylindric, 

 usually with 8 or 16 colored striae, when dry usually 8 (-16) -furrowed; an- 

 nulus persistent; peristome mostly double, sometimes single, rarely none, 

 usually with 16 broadly lanceolate teeth in pairs, and 8 to 16 filiform seg- 



