454 



A. HESSELBO 



S. Iceland: Thorlakshver, on warm clayey ground. 



Although this form differs somewhat from B. fallax in habit, in the 

 smooth leaves with rounded apex, and in the divergent form of the 

 perichsetial leaves, yet there is hardly any doubt that it must be re- 

 ferred to this species. Setting apart the absence of papillse the leaf- 

 tissue is quite typical, and the form and the plication of the lower 

 leaves are exactly as in B. fallax. It should be remembered that the 

 occurrence on a warm substratum produces very divergent forms also 

 in other mosses, e. g. Philonolis, Catharinea and Oligotrichum. Near 

 Reykir, B. fallax was collected both on stones by the river, in sand- 



Fig. 1. Bctrbula fallax Hedw. a, Leaves of the plant from Reykir (X 20). b, Leaves of 



var. Itevi folia ; c, perichsetial leaves of same. 



filled tufts about 2 cm. high, in a somewhat typical form, and on a warm, 

 damp substratum. Plants from the latter locality form a transitional 

 stage to var. Iwvifolia. It grew in somewhat loose tufts, 34 cm. high, 

 which in colour and appearance agreed with var. Icevifolia. The lower- 

 most leaves are pointed, the uppermost rounded; the perichaetial leaves 

 are lanceolate, rounded, with rather faint nerve. The leaf-cells are di- 

 stinctly papillose, sometimes as highly as in the typical form, some- 

 times much more faintly. 



64. Barbula cylindrica (Tayl.) Schimp. 



N. Iceland: Hof near Eyjafjordur (O. D.)!. S. Iceland: Vestmannaey ! ; 

 Ytri Skogur (H. J.)!; Fljotshlid!; Holt!; Drangshlid!; Hornafjordur!. 

 W. Iceland: Esja near Kollafjordur!. 



This species occurred commonly, and often abundantly, on tuff-rocks 

 in S. Iceland and on Vestmannaey. There it also grew abundantly on 

 sandy soil and on lava blocks near the sea. In the other localities it 

 was found but scantily. Fruit was collected only near Holt, where, at 

 the end of July, both old and yet green capsules were collected from 

 the same tuft. 



