Species of Scleropodium 537 



open between the articulations ; cilia two, very strongly nodose ;. 

 spores rough, about .016 mm., maturing in winter. 



Type locality, Langford, near Warrenton, England. 



Growing on stumps and old logs, roots of trees and rocks. 

 California, Washington, Oregon, Vancouver Island, Lake Atha- 

 basca (Macoun), Alaska (Kellogg). 



Illustrations : See above ; also Dixon and Jameson, pL i^j^ 



B; Husnot, Muse. Gall. />/. 7/5. 



ExsiccATi ; As Hypniun cacspitosum ; SuII. & Lcsq. Muse. 

 Bor.-Am. 5 10 ; Macoun, Can. Muse. 290 (In part only. See under 

 S. colpopJiylluin'^ 



Sterile and robust S. cacspitosum is hard to distinguish from S. 

 illccehntnL In general it is more slender, less frequently julaceous 

 with closely imbricated leaves, with tapering branches and nar- 

 rower more gradually tapering leaves having thcii* median lea 

 cells lon^rer and rather narrower and the differentiated basal cells 

 more numerous. It also comes very close to slender forms of S. 



colpophylhim, 



Sullivant and Lesquereux's exsiccati (/. c.) do not agree very 



closely with Wilson's Muse. Brit. 349, or with the plate in the 

 Bryologia Europaea. The stem leaves are too abruptly acuminate 

 with too short an acumen. This is a variation in the direction of S. 

 obtiisifolium.hwt as these characters are variable according to Wil- 

 son's own description, these specimens should probably be referred 

 to a form of S. caespitositni. Dr. M. A. IIowc has collected a 

 moss oil " Redwood stumps, Mill Valley, Marin Co., California, 

 January i6, 1892," that agrees very closely with Wilson's exsic- 

 cati so that there can be no reasonable doubt of the identity of 

 the European and American plant. 

 ■ I feel quite sure that Hypnum lentiun Mitt. Journ. Linn. Soc. 



t 



8: 36. 



cacsp 



tosuin, and probably is identical with it. vS". cacspitosiiui was very 

 little known at the time Ifypiniui Icntuui was published and a care- 



E ■ 



ful reading of the original description will fail to show any distinc- 

 tions of importance between the two. The matter cannot be 

 dofinitelv settled until Mitten's tvne is accessible. 



