436 A. HESSELBO 



rocks, e. g. on rock-sides along waterfalls and in clefts, where it forms 

 large cushions, often almost one square metre in size, of a peculiar 

 verdigris colour. In the lava-fields of SW. Iceland it is one of the most 

 frequent species on the walls of caves and the sides of clefts. It hardly 

 ascends higher than about 300 metres above sea-level. It is almost 

 always sterile. The only fruiting specimen was collected by Morch. 

 but no habitat is given. 



6. Weisia crispata (Br. germ.) Jur. 



SW. Iceland: Reykjavik, fr.!. SE. Iceland: Hornafjordur!; SW. Ice- 

 land: Alafoss!. 



Near Reykjavik it grew in crevices of basalt rocks associated with 

 Encalypta rhabdocarpa and Bryum elegans var. carinthiacam. The fruit 

 had just ripened on June 6, 1909. Near Hornafjordur also it grew in 

 small crevices of basalt. Only sterile specimens have been found. 



7. Weisia viridula (L.) Hedw. 



S. Iceland: Vik, associated with Brachythecium velntimim (H. J.)!. Vest- 

 mannaey, Helgafell!, on a humus-covered block of lava. 



Only sterile specimens have been found. 



The species is recorded by Morch from Iceland, but no specimens 

 of it are to be found in the collections. 



8. Weisia Wimmeriana (Sendtn.) Br. eur. 



N. Iceland: Hof near Eyjafjordur (O. D.)!, fr. 



It grew there mixed with Eurynchium diversifoliiim on rocks coated 

 with soil. 



9. Dicranoweisia crispula Hedw.) Lindb. 



Very common all over Iceland. 



Dicranoweisia crispula is one of those species which is of equal 

 frequency in all parts of Iceland, both at the coasts and in the high- 

 lands, and at all altitudes up to the snow-line. In the low land it 

 grows, like Andrecea, on dry stones and rocks, but like the latter, it 

 descends to the ground on mountain heights where it forms, both on 

 the ground or on blocks of rock, dense, jet-black cushions. It is almost 

 always found in fruit. 



Note. Dicranoweisia cirrata is recorded by Hornemann, but has 

 undoubtedly been confused with D. crispula. 



10. Dicranoweisia compacta (Schleich.) Schimp. 



N. Iceland: Hof near Eyjafjordur (O. D.)!. Only sterile specimens 

 have been found. 



