482 



A. HESSELBO 



rhomboid, equilateral-hexagonal or almost quadrate cells (forms from 

 AkureyrD, to more or less longly pointed, with excurrent nerve, and 

 narrower, rhomboid 



or elongate-hexagonal cells. 



14(5. Bryum bimum Schreb. 



E. Iceland: Vallanes. 



It has been collected only 



/ 



scantily on damp ground, with 

 capsules which were not ripe 

 at the end of June. 



Two sterile Brya, collected 

 by Helgi Jons son near Stod 

 in E. Iceland and in Budahraun, 

 are referred to this species by 

 C. Jensen. The leaves in both 

 the plants taper to a long point, 

 are longly decurrent, have nar- 

 row basal cells, and the nerve 

 excurrent; therefore, the plants 

 probably belong to Firynm uffine, 

 but owing to the absence of 

 fruit the determination is quite 

 uncertain. 



147. Bryum affine (Br'uch) 

 Lindb. 



Bryum cuspidcitiim Schimp. 



Commonly distributed. 



One of the most frequent 

 species of Bryum, and occurs 



everywhere in the lowlands on damp sandy or peaty ground, and on 

 humus-covered rocks. The fruit ripens in the first half of July. It 

 varies exceedingly in all its parts. It is said to differ from the very 

 nearly allied B. cirratnm in its sex, the smaller, smooth spores, and the 

 decurrent leaves with the broader cells; but all these features are so 

 variable that in reality it is hardly possible, at least in the Arctic- 

 countries, to separate these two species. 



The plant is usually synoicous, but $ flowers are also almost 

 always present; $ flowers are more rare. The spores vary in size from 

 0.008 to 0.020 mm., and often differ rather considerably in size in the 

 same capsule, or in different capsules from the same tuft; the most 

 frequent size is 0.0120.017 mm.; they are sometimes smooth, sometimes 

 finely papillose. The leaves vary in form from about ovate to lanceolate, 

 tapering more or less to a long point, and with the nerve longly excurrent. 

 In form the leaf-cells correspond nearly with the leaf, so that short 

 leaves have broader cells than have those which are long and narrow. 



Fig. 1. Bryum Grcenhmdii. Peristome (X 250; phot.). 



