514 A. HESSELBO 



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



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

 Holt!; Seljalandl"^. 



Gliemann records that this species was found by Morch, but 

 there are no specimens of it in the collections. 



This species was found onl}' in the southernmost part of Iceland, 

 where it is frequent in several piaces on Vestmannaej' and along the 

 whole stretch of country south of E3'jafjall. Here it grows especially 

 in the clefts at the foot of rock-^Yalls or aniong large stones. Near 

 Seljaland it was found abundanth' on slopes stretching down towards 

 the Seljalandsa, associaled with Thuidium delicatiiliim, Camptothcciiim 

 liitescens, Scleropodiiim piiriim and Hijlocominm spp. 



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



NW. Iceland: Dyrafjordur (Hartz^!. ^Y. Iceland: Esja!. S. Iceland: 

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

 Drångshlid!. 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. delicatiiliim becomes especialh' luxuriant on warm ground. By 

 the hot springs near Skålholt it grew abundantly in cushions almost 

 10 cm. deep, associated with Hypniiin straminciim. H. Lindhergii and 

 Hylocomiiim sqiiarrosum. Onh' sterile specimens were found. 



232. Thuidium Philiberti Limpr. 



SE. Iceland: Hornafjordur!. SW. Iceland: Ålafoss!. S. Iceland: 

 Reykirdalur!; Holt!; Vestmannaej'!. 



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

 in Company with, T. delicatiiliim from which it cannot be distinguished 

 in the lield. Near Ålafoss it grew on boggy ground along the river. 

 In Reykirdalur it was common on rather dry, raoss-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 piants, 

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

 with 4—5 cells, and sometimes such leaves in which the apex consists 

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



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



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

 Hof near Eyjafjordur (O. D.)!; Mx'vatn!; Vidim\ri (Grl.)!; Tverå in Oxna- 

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



