Species of Scleropodium 533 



■ 



ciduous ; teeth united at base, nearly colorless and papillose above ; 

 segments nearly as long as the teeth, finely papillose, from basal 

 membrane equaling two fifths the length of tlie teeth ; cilia 2, 

 well developed, appendiculate ; spores nearly smooth, maturing in 



winter. 



pinnatifidum from California in the Gray Herba 



Harvard is more slender and nearly regularly pinnate. 



Type locality, France near Paris. Type at Paris. 



On shady grassy soil and on shaded rocks. 



California, Idaho, Washington, British Columbia, Vancouver. 

 . ExsiccATi: Sulliv. & Lesq. Muse. Bor.-Am., P:d. 2, 508. 



Illustrations: Bry. Eur. pL 557 > Husnot, Muse. Gall. //. 

 gS; Dixon & Jam. Handb. Brit. Mosses, //. JJ, G ; Limpricht, 



Rab. Krypt. Fl. 4 : /. 378- 



The robust habit, julaceous turgid branches, and thick unsym- 



metric horizontal capsules make this species easy to recognize when 



typical. It grades insensibly into 5. ohtnsifoHum and it is often 



very hard to say to which species certain forms should be referred. 



Scleropodium obtusifolium (Hook.) Kindb. Cat. Can. PI. 6 : 202. 



1892 



I 



Hypnum obtnsifoVmm Hook. Drumm. Muse. Am. no. 193. 



Hyp 



1851. 



ifolius Mitt. J 



1865. 



Gamctophyte submerged or neariy so, attached to stones in 

 brooks li<Tht green above, brown below : stems irregularly branch- 

 in^ naked below and roughened by the leaf bases of the fallen 

 leaves • young stems and branches julaceous ; branches 5-20 mm. 

 lono- • leaves close imbricate and apprcssed when dry, more open 

 wh?n moist, broadly ovate to suborbicular, very concave, spoon 

 shaped round-obtuse, without acumination or very shortly cuspi- 

 date 1^2 X I mm., not plicate or sulcate except under pressure, 

 entire or faintly denticulate near apex ; costa stout, extending five 

 sixths the length of the leaf; median leaf cells linear vermicular, 

 O 05-0.065 mm. long, 8-10 : i ; apical cells broader and shorter, 

 2-3:1; alar cells rather abruptly enlarged to form distinct auricles, 

 0.013 mm. long, 3:1. 



Type from rivulets in the Rocky Mts., Drummond. Type not 



seen, probably at Kcw. 



T\^.^AU^A frr^m Dnimmond's Muse. Am. IQ^, which is sterile. 



