53G Grout : Revision of North American 



tlic type is much rougher than the original description would lead 

 one to expect. • 



' The leaf cells are much shorter than in most species of the 



F 



genus, but in all other particulars it seems closely related to the 

 other species. 



Type in Mitten Herbarium. 



ScLEROPODiuM CAESPiTOSUM (Wils.) Br. & Scli. Bry. Eur. //. j^6. 



1853 



Hypnuui cacspitosuin Wils. English Bot. Suppl. //. 28^8. 1 849. 

 Also Bry. Brit. 344. pi. ^j. 185 i. 



Ilypinmi cacspitivis C. Muell. Syn. 2: 354. 1851. 



Eiirhynchiiim col pop] ly Hum Jlagdliformc Barnes, Bot. Gaz. 16 : 

 207. 1891. 



Gametophy te in rather thin Tdosely interwoven mats, light or 

 dirty green: stems creeping, 5-10 cm. long, irregularly divided 

 and branching ; branches usually longer and more slender than in 

 S. illccchntui, tapering, sometimes julaceous, but less frequently so 

 than in ^. illcccbnun: branch leaves, from the middle of the branches 

 0.9-1 X 0.3-0.4 mm., ovMte to oblong-lanceolate, usually taper- 

 ing and acute at apex but sometimes nearly as obtuse as in S. 

 illcccbnun, apprcssed and imbricate to erect-open when dry, con- 

 cave, scarcely plicate when moist, not dccurrcnt, finely serrate at, 

 apex; median cells narrowly linear-vermicular, 8-12 : i ; quadrate 

 basal cells in several rows, alar little differentiated from the other 

 basal cells ; apical cells broader and shorter; costa stout, frequently 

 forked, extending three fourths the length of the leaf, often cndin^r 

 m a spine at the back of the leaf; stem leaves ovate to ovate-lance- 

 olate, slenderly acuminate, with a larger number of short basal and 

 alar cells, alar cells somewhat enlarged at the decurrent angles. 

 Dioicous ; inner pcrichactial leaves loosely sheathing at base, grad- 

 ually narrowed to a long subfiliform and subcrect acumen, dis- 

 tantly and slightly denticulate above or sometimes entire, faintly 

 costate. 



Sporophyte 10-15 '"i"- l^igl^ : seta red-brown, twisted to the 

 right, very rough : capsule light brownish-grccn, oblong cylindric, 

 subcrect, slightly unsymmctric, with operculum 2-2.5 mm. long, 

 about 2.5 : r ; operculum conic-apiculate to conic-rostellate, often 

 appearing short rostrate when dry ; annulus of two rows of cells, 

 deciduous ; teeth of peristome slender, subhyaline and slightly 

 papillose at apex ; segments nearly as long as the teeth, yellowish, 

 more strongly papillose, from a wide basal membrane and widely 



