THE BRYOPHYTA OK ICELAND 435 



with Haplozia crennlata and Fossombronia Dumortieri, more rarely with 

 Gymnocolea inflata. It is almost always sterile; on plants from Thor- 

 lakshver flowers as well as a few ripe capsules were found, besides, 

 here and there at the bottom of the tufts, the characteristic large 

 spores (9. 6. 1912). 



Note. Phascum cuspidatum, Ephemernm serratum and Sphcerangium 

 muticum are enumerated on older lists, but no specimens of these 

 species are to be found in the collections and their occurrence in Ice- 

 land is very improbable. 



FAM. WEISIACE^E. 

 3. Gymnostomum rupestre Schleich. 



E. Iceland: Geithellir!. N. Iceland: Akureyri!; Modruvellir: Hof 

 (0. D.)!. W. Iceland: Brynjudalur (Grl.) !; Esja!. S. Iceland : Skalholt !; 

 Thingvellir!. 



Around E} r jafj6rdur it is common on damp rocks up to a height 

 of about 300 metres; it was also found in numerous localities in SW. 

 and S.Iceland and is common, for instance in Esja. It occurs especi- 

 ally on damp rock-sides near waterfalls and in clefts, often forming 

 extensive mats; now and then it is also found in dry localities. Only 

 sterile specimens have been found. 



4. Hymenostylium curvirostre (Ehrh.) Lindb. 

 Barbula curvirostris Lindb. 



N. Iceland: Mwatn (Grl.)!. W. Iceland: Reykholt (Grl.)!, in both 

 localities sparingly and also sterile. S. Iceland: Merkjafoss (F.)!; Bar- 

 karstadr, fr.!; Holt, fr.!; Vestmannacy, fr. !. 



In S. Iceland the plant is no doubt common on faces of damp tuft- 

 rocks. In several localities near Barkarstadr and Holt it occurred 

 abundantly in clefts along rivers or in caves and in depressions in tuft 

 rocks; it was usually richly in fruit, and associated with Preissia coin- 

 mutata, Fegatella, Haplozia riparia, etc. On '"Kleven" on the island of 

 Vestmannaey it grew on the face of a tuff rock, through which water 

 was percolating, forming with Haplozia riparia large cushions which 

 were saturated with water. 



5. Anoectangium compactum Schwgr. 



Pleurozyyodon cestiuus (Hedw.) Lindb. 



"In Islandia" leg. Morch! and figured in Flora Danica, tab. 1893, 

 fig. 2, under the name of Gymnostomum curvirostre. 



E. Iceland: Seydisfjordur, common!; Berufjordur, common!. W. Ice- 

 land : Grundarfjordur (H. J.)!; Hafnarfjordur (Grl.;!); Esja!; Svinahraun!. 

 S. Iceland: very common!; Vestmannaey!. 



This plant is very common in S., SW. and E. Iceland, but it does, 

 not appear to occur in N. and N\V. Iceland. It grows especially on damp 



