61 



collecting was done principally along the river Glera, a day at 

 Isafjordhur in the northwest with extensive collecting near the 

 shore, and finally about six weeks at Reykjavik in the southwest, 

 from which place excursions were made as far as the Olfusarbru 

 in the southern lowland, inland to Thing\-ellir, and to the north- 

 ward to Borgarnes on the west coast. Species not previously 

 reported or left uncertain in previous records are : 



1. Sphagnum magellanicum Brid. Vifilsstadhir near Reyk- 

 javik, Aug. 13; in more immediate proximity of Reykjavik, 

 Aug. 15. It is not at all impossible that older records of S. 

 cymbifoUum from the island are referable to this species. I 

 found none of the true S. cymbifoUum {S. palustre Linn.), but of 

 its group only S. magellanicum and S. papillosum Lindb., which 

 last had been previously reported. In general one is surprised 

 by the paucity of Sphagmim in Iceland, both as to bulk and 

 variety. Probably the predominantly basic nature of the vol- 

 canic rock is largely responsible. The Icelandic turf and peat 

 are mostly produced from plant remains other than Sphagnum. 



2. Dicranella Grevillea^ia (Brid.) Schimp. Wet spot on top 

 of Lagafell near Reykjavik, Aug. 4; fruited. This summit is 

 not a very high one, as its name indicates, but was the highest 

 accessible to me. The plant is one of decidedly arctic-alpine 

 tendencies. 



3. Dicranella Schreberi (Sw.) Schimp. Wet place among rocks 

 on the hill by Grotta near Reykjavik, July 18; fruited. This 

 species is allied to the last, my specimens showing very nicely 

 the characters supposed to separate them. 



4. Campylopus Schimperi Milde. Marshy place just outside 

 Reykjavik to the west; July 20. This species seems to be the 

 one of most northerly tendency in the genus and its distribution 

 links Europe through Iceland and Greenland with North America, 

 a phenomenon common enough in various other genera, but 

 apparently unique in Campylopus. The C. compactus Schimp. 

 of Gronlund's list is to be understood as this species, but he left 

 it with a ? as of uncertain identification. His specimen was 

 from the mountain Esja not far from Reykjavik. 



5. Didymodon rufus Lor. On the lava-field by Hafnarfjordhur, 



