(H4) 



larger leaves often all green or partly green and partly pur- 

 ple. These specimens have the cell walls less thickened and 

 pitted than in the species (777). 



Hypnum Richardsoni (Mitt.) Lesq. & James. Dawson in 

 swamps. In fine fruit July 27. This species is distin- 

 guished from cordatum and giganteum, the two most closely 

 related, I believe, by the shorter nerve, extending only | or | 

 up and often forking in the upper part. The perichaetial 

 leaves are ecostate to faintly | costate (77§)- 



Hypnum Schreberi Willd. {Hylocomium -parietinum (L.) 

 Lindb.) Lake Lindeman and Dawson, not fruiting (779). 



Hypnum stramineum Dicks. Lake Lindeman (780). 



Hypnum turgescens (Jensen) Schimp. Just below White- 

 horse Rapids in dried-up swamp. Growing in broad de- 

 pressed mats (781). 



Hypnum turgescens uliginosum Lindb. In swamps with 

 the preceding. This variety has elongated stems and dis- 

 tant, more or less spreading leaves (782). 



Hypnum badium Hartmann. On margin of pond just be- 

 low snow banks about 1000 feet above Lake Lindeman, also 

 at Dawson on wet, shady bank. From the remarks in Les- 

 quereux & James' manual that " It is considered by Mueller to 

 be a form of H. revolvens" one would suppose the leaves to 

 be somewhat similar to that species, but in fact they are very 

 distinct. The median leaf-cells are only about \ as long 

 (.040 to .060 mm.), the cell walls are thicker except at the 

 points where the rounded ends overlap, where they become 

 very thin and the leaf is differently shaped. In badium the 

 widest part of the leaf is near the middle and gradually 

 tapers to a base only about \ as wide. Above the leaf tapers 

 rather abruptly to a sharp point. In rcvolvcns the leaf base 

 is wider, the leaf above tapers gradually to a long, slender 

 point and the basal cells are much less differentiated. In 

 badium there are usually one or two rows of well-defined, en- 

 larged, oblong cells at base with occasionally an almost in- 

 flated cluster in the angles. It is a plant of northern distri- 

 bution, having been previously collected in Norway, Sweden, 

 Greenland and Labrador (795). 



