422 A. HESSELBO 



68. Odontoschisma Macouni (Aust.) Underwood. 



S. Iceland: Bergarfoss near Hornafjordur!; E. Iceland: Grottafoss 

 near Seydisfjordur! at an allitude of about 200 metres. N. Iceland: Hof 

 (O. D.)!. SW. Iceland: Svinahraun!. 



This plant grows partly in small unmixed tufts, parth' mixed with 

 other Hryophyta such as Anoectanginm lapponiciim, Distkhhim montamim, 

 Pohlia cnida, Blepharostoma trichopliyllum on damp humus-covered rocks. 

 In Svinahraun it grew in lava-defts fllled with humus. 



69. Calypogeia Trichomanis (L.) Corda. 



N. Iceland: near Mvvatn i^Grl. !); Reykjahlid!. W. Iceland: near se- 

 veral hot springs in ReykholtdalurI; Tunguhver probably Deildatungu- 

 hver) (Grl. ;!); Kollafjordur!. S. Iceland: Laugaråshver!; Geysir!. More- 

 over, Gronlund records this species from Hvammur, but no specimens 

 of it are to be found in the collections. 



The plant grows in all the above localities on a warm substratum. 

 Near Reykjahlid it covered the roof of a lava-cave which had a tem- 

 perature of about 25°. In the other localities it occurred on a warm 

 damp substratum woven into mosses such as Sphagnum, Hypna and 

 Pohjtrichnm, or in pale green to brownish cushions above them. In 

 Reykholtdalur where it occurred abundantly in several localities, the 

 temperature in the tufts was from 25° to 27°. 



70. Lepidozia setacea (Web.) Mitten. 



S. Iceland: Merkjåfoss (Feddersen)!. 



It was found very sparingly in the above localit}' associated with 

 Cephalozia pleniceps and woven into a tuft of Dicraniim scopariiim. 



Fam. PTILIDIOIDEÆ. 



71. Blepharostoma trichophyllum (L.) Dum, 



Very common from the lowlands up to about 500 — 600 metres 

 above sea-level. 



This species rarely forms unmixed tufts, but grows almost always 

 woven into tufts of other species and is met with in the most varied 

 localities, on boggy ground and damp gravelly ground along rivers, in 

 lava-fields, on damp rocks, and especialh' in abundance in rock-caves 

 where it often covers the roof and walls in association with Ambly- 

 stegiiim Spriicei, with a thin dark-green layer. 



Fruit occurs rather rarely; but it is found plentifully in Alman- 

 nagjå!, and near Hof in N. Iceland (O. D.)!. 



72. Chandonanthus setiformis (Ehrh.) Lindb. 



In the herbarium of the Botanical Museum there is a specimen, 

 labelled by Morch "In Islandia, among Trichostonmin canescens, Aug. 1820." 



