THE BRYOPHYTA OF ICELAND 415 



It is hardly possible to draw any distinct boundary line between 

 this form and the type, the thicl<enings of the leaf-ceUs showing all 

 transitional stages from quite thin-walled to decidedly collenchymatous 

 cells, and the colour also varying according to the habitat. Fruit is 

 rare; genimæ are as a rule present. 



Var. confertifolia (Schiffn.) syn. Lophozia confertifolia Schiffner. Piants 

 agreeing exactly with the description of this form and with the figure 

 in Rabenhorst's Kryptogamenflora, fig. 314, occur rather commonly 

 on damp gravelly soil in NW. Iceland associated with all the transitional 

 forms of L. ventricosa, 1 think they can only be regarded as Alpine 

 forms of the present species. 



44. Lophozia Wenzelii (Nees) Steph. 



E. Iceland: Seydisfjordur !; Vallanesl. N. Iceland: Tverå in Oxnadalurl. 

 NW. Iceland: Isafjordur, (at about 200 metres alt.j!. SW. Iceland: Svi- 

 naskard (at about 400 metres alt.). 



It grows on wet gravelly soil or peat, especially along streams 

 where it forms low, dense carpets or grows mixed with Alicnlaria sca- 

 laris, Dicranella crispa, Distichiuin inclinatiiin and other Bryophyta. Near 

 Isafjordur it was growing by a small stream together with Sphagnum 

 sqaarrosiim. 



45. Lophozia alpestris (Schleich.) Evans. 



Verj' common all over Iceland. 



It generally grows woven into tufts of other Bryophyta, but now 

 and then forms tufts by itself. It is found on almost every kind of 

 substratum, from the sea-level to mountain heights. It occurs most fre- 

 quently on rocks, especially those which are somewhat damp. but is 

 also met with on damp ground along the bank of streams, on the gra- 

 velly flåts of mountain heights, in lava-clefls and woven into the moss- 

 carpets of GW/nm/a-heaths. 



Fruit and calyces occur rarely and have been found only in XW. 

 Iceland: Gnupsdal! and in S. Iceland: Seljaland i^at about 350 metres!; 

 Svinahraun!. Male piants are rather common, and gemmæ are very 

 often present. 



46. Lophozia excisa (Dicks.) Dum. 



S. Iceland: Reykir!; fr. 



It grows there on damp gravelly soil by a small stream associated 

 with Eucalyx siibellipticus, Scapania ciirta and Dicranella crispa. 



. This species is recorded from Iceland by Morch, but of the two 

 specimens found in the collection in the Botanical Museum in Copen- 

 hagen under this name, one is Lophozia uentricosa var. porphyrolenca and 

 the other L. heterocolpos. 



Note. Lophozia bicrenata (Schmid.) Dum. is recorded to have been 

 found near Krisuvik by Steenstrup, but the packet contained only a 

 mixture of several other species of Lophozia. 



