THE BRYOPHYTA OF ICELAND 427 



altitude of almost 500 metres, g plants are common, fruit rather rare. 

 The majority of the plants bear gemmae. 

 Var. gritif'Hlftta (Mass.) C. M. 



S. Iceland: Reykir!; Vestmannaey!. NW. Iceland: Armuli!. 



Var. rosacea (Corda) Carr. is only exceptionally met with typically 

 developed, while forms transitional between the present variety and the 

 type are rather common. 



The plant is usually green or brownish-green, more rarely reddish. 

 On damp ground it becomes larger and approaches S. irrigua. The 

 leaves vary somewhat in form. The antical lobe is usually pointed, in 

 the lower leaves it is, however, often rounded; it is more rare for all 

 the leaves to be rounded. The leaf-cells are as a rule thin-walled or 

 somewhat thickened at the angles. Forms with highly thickened, red- 

 dish-brown cell-walls are more rare, and occur always in exposed localities. 



86. Scapania Bartlingii (Hampe) Nees. 

 Scapania Carestiae de Not. 



S. Iceland: Drangshlid associated with Amphidium Moiigeottii and 

 Bryum archangelicnm (H.J.)!. 



Note. Scapania nemorosa is enumerated in the majority of the 

 older lists, but all the specimens in the collections belong to Sca- 

 j)ania nndulata. 



FAM. RADULOIDE.E. 

 87. Radula complanata Dum. Gottsche. 



S. Iceland: Hornafjordur!. E. Iceland: Hof!; Djupivogur!; Seydisfjordur !. 

 X. Iceland: Thrastarholsargil, fr. (O. D.)!. W. Iceland : Flatey (Grl.)!; 

 Budahraun (H.J.)!. Common in SW. and S. Iceland!. 



The plant is common in E., W. and S. Iceland, while it appears to- 

 be absent from NW. Iceland and to be rare in N. Iceland. 



It occurs only in the lowlands and rarely ascends higher than 

 about 300 metres. In a few localities in Esja and near Kolvidarhol it 

 was collected at an altitude of about 400 metres. It grows especially 

 on dry, or only slightly damp, shaded rock-sides, mostly in clefts and 

 caves, in company with Mctzgcria farcatu, Lcjciinca cavifolia, etc., and 

 often bears gemmae and in S. Iceland fruit also. It was sometimes col- 

 lected on the bark of trees, viz. on birch on Flatey and on mountain 

 ash in Budarhaun. 



FAM. MADOTHEGOIDE.E. 

 88. Madotheca Cordseana (Hubener) Dum. 



Madotheca rivularis (Dicks.) Xees. 



"In Islandia" (Morch ;!.' E. Iceland: Hof !: Seydisfjordur (H. J.)!; Beru- 

 ijordur!. NW. Iceland : Dvrafjordur! at an altitude of about 150 metres; 



28* 



