514 A. HESSELBO 



230. Thuidium tamariscinum (Hedw.) Br. eur. 



Vestmannaey: Heljusdalur and Stora Klit!. S. Iceland : Barkarstadr!; 

 Holt!; Seljaland!. 



Gliemann records that this species was found by Morch, but 

 there are no specimens of it in the collections. 



This species was found only in the southernmost part of Iceland, 

 where it is frequent in several places on Vestmannaey and along the 

 whole stretch of county south of Eyjafjall. Here it grows especialry 

 in the clefts at the foot of rock-walls or among large stones. Near 

 Seljaland it was found abundantly on slopes stretching down towards 

 the Seljalandsa, associated with Thuidium delicatulum^ Camptothccinm 

 lutesccns, Scleropodium puriim and Hulocomiiim spp. 



231. Thuidium delicatulum (Dill., L.) Mitten. 



NW. Iceland: Dyrafjordur (Hartz)!. W. Iceland: Esja!. S. Iceland: 

 Reykirdalur!: Skalholt!; Breidabolstadr!; Barkarstadr!; Seljaland!; Holt!; 

 Drangshlid!. SE. Iceland : Hornafjordur!. 



Common from Hornafjordur in SE. Iceland throughout the whole of 

 S. and SW. Iceland to Hvalfjordur. There it grew on grass-covered 

 slopes, especially on somewhat damp ground, up to a height of about 

 200 300 metres; occasionally also on more damp meadow land. 

 Near Barkarstadr it was common even at an altitude of about 320 metres. 



T. delicatulum becomes especially luxuriant on warm ground. By 

 the hot springs near Skalholt it grew abundantly in cushions almost 

 10 cm. deep, associated with Hypnum stramineum, H. Lindbergii and 

 Hylocomium squarrosum. Only sterile specimens were found. 



232. Thuidium Philiberti Limpr. 



SE. Iceland: Hornafjordur!. SW. Iceland: N Alafoss!. S. Iceland: 

 Reykirdalur!; Holt!; Vestmannaey!. 



This species has a quite similar distribution to, and often grows 

 in company with, T. delicatulum from which it cannot be distinguished 

 in the field. Near Alafoss it grew on boggy ground along the river. 

 In Reykirdalur it was common on rather drj% moss-grown slopes; it 

 was also common around Holt, south of Eyjafjall. 



Thuidium Philiberti is a weak species which in a sterile condition 

 can be distinguished from T. delicatulum only by the length of the leaf- 

 apex; the length varies considerably, however, in the Iceland plants, 

 leaves being sometimes found in which the apex is elongated hair-shaped 

 with 45 cells, and sometimes such leaves in \vhich the apex consists 

 only of a single cell or of two. Onty sterile specimens have been found. 



233. Thuidium abietinum (Dill., L.) Br. eur. 



E. Iceland: Hof!; Vallanes (H. J.;!). N. Iceland: Akureyri (GrI.;!); 

 Hof near Eyjafjordur (O. D.)!; Mvvatn!; VidimVri (GrI.)!; Tvera in Oxna- 

 dalur!. W. Iceland: Esja!. S. Iceland: Barkarstadr!; Vestmannaey!. 



