274 A MANUAL OF MOSSES 



gularly quadrate-rhomboid to oblong-hexagonal, ranging from 

 1-3 :1. some of them wider transversely, the apical shorter than 

 the median, the alar numerous and quadrate to transversely 

 elongate : capsule cernuous, reddish-brown, more or less curved, 

 oblong, minute ; peristome perfect with double cilia or some- 

 times 3 ; spores mature in summer : autoicous. 



Mainly on shaded ledges of limestone ; Europe, Asia, and, 

 in North America from New Brunswick to southeastern Penn- 

 sylvania and westward to the Rocky Mountains. Rare in our 



region. 



Huntingdon : On limestone rocks, one mile south of 



Pennsylvania Furnace, July 13, 1909. 

 O. E. J. 



3. HOMOMALLIUM (Schimper) Loeske. 



Autoicous : slender, rarely somewhat robust, light to 

 brownish or yellowish-green, more or less shining; stems 

 creeping, divided and irregularly pinnately branched, with the 

 branches short, erect, and more or less curved ; leaves erect- 

 spreading or secund above, the lower mostly straight, the upper 

 often curved, concave, non-plicate, oval- to oblong-lanceolate, 

 the base narrowed and but little decurrent, apex elongate- 

 subulate, the margins plane, entire or serrate at apex ; costa 

 none or short, thin, and double, or longer and sometimes 

 forked ; leaf-cells narrowly prosenchymatous, smooth or with 

 projecting ends, towards the base shorter and a little wider, 

 the alar numerous, small, quadrate, green, passing rapidly into 

 the narrower cells above ; inner perichaetial leaves almost 

 sheathing, abruptly acuminate : seta 1-2 cm. long, thin, com- 

 pressed, reddish ; capsule inclined to horizontal, oblong, when 

 dry and empty strongly curved and narrowly constricted below 

 the mouth ; annulus revoluble ; peristome-teeth yellow, basally 

 confluent, dorsally cross-striate, bordered, pale and papillose 

 above, trabeculse numerous and close below, above strongly 

 projecting, inner peristome yellowish, papillose, and with a 

 high basal membrane, segments keeled, split, cilia 2-3, papil- 

 lose, nodose ; spores small ; lid shortly and acutely rostrate. 



A genus of about 8 species, occurring on rocks and tree- 

 trunks ; 2 species in North America ; 1 species in our region. 



1. Homomallium adnatum (Hedwig) Brotherus. 



(Hypnum adnatum Hedwig; Amblystegiella adnata Nichols; 

 Stereodon adnatum Mitten). 



(Plate XXXIX) 



Widely cespitose in thin, closely adherent mats, pale green, 

 or yellowish-green, darker below : stems irregularly branch- 

 ing, creeping, the branches close, short ; leaves close, erect- 

 spreading, ovate or oblong, shortly and widely acuminate- to 



