488 A. HESSELBO 



where it often occurs abundantly in the clefts of tuff rocks. In West 

 Iceland it is met with here and there, while it is rare in North Iceland 

 and has not 3 r et been found in East Iceland. The fruit, which is found 

 ever3 T where, ripens in the first half of June. 



167. Mnium spinosum (Voit) Schwaegr. 



Astrophyllum spinosum Lindb. 



N. Iceland: Asbyrgi (St.)!; Hof near Eyjafjordur (O. D.)!; Akureyri!. 



In all the above localities it was found on dry grass-covered ground 

 growing among Hylocominm proliferum, H. sqiiarrosum , H. triquetrum, 

 Hypnam uncinatnm and Lophozia lycopodioides. Near Akureyri it oc- 

 curred, however, also on a somewhat damp slope (200 metres above 

 sea-level), intermixed in a large tuft of Mnium stellare. Only $ flowers 

 have been found. 



168. Mnium undulatum (L.) Weiss. 



Astrophyllum undulatum Lindb. 



W. Iceland: Kollafjordur!, at an altitude of 100 metres. S.Iceland: 

 Yik; Hnappavellir; Hjorleifshofdi (H. J.)!; Reykir!; Breidabolstadr!; 

 Barkarstadr !; Seljaland!; Holt!; Drangshlid!. Vestmannaey !. 



This species has been found only in the south-western part of the 

 country, where it is common on Flotshlid and along Eyjafjall. It was 

 found in several places on Vestmannaej^, for instance abundantly in 

 Heljusdalur. It grows as a rule in damp soil at the foot of rock-walls 

 and in clefts, especially in localities which are well protected and have 

 a luxuriant grass-vegetation. It is also met with in damp caves, for 

 instance near Reykir. Only sterile specimens have been found. 



169. Mnium cuspidatum (L.) Leyss. 



Astro])hyllum siluaticum Lindb. 



N. Iceland: Hof near Eyjafjordur (O. D.)!. S. Iceland: Holt!. Vest- 

 mannaey!. 



Near Holt it grew at the bottom of and up on the sides of a small 

 tuff-cave. On Vestmannaey it was found rather abundantly among grass 

 on a somewhat damp slope. 



Mnium cuspidatum is enumerated inVahl'slist, and has, moreover, 

 been recorded from several localities by Gronlund, Stefansson and 

 Helgi Jonsson. All these specimens are, however, wrongly determined, 

 and the majority of them belong to M. affine. 



170. Mnium medium Br. eur. 



Astrophyllum medium Lindb. 



SE. Iceland: Hornafjordur. 



It grew here on boggy ground mixed with M. affine and M. cinclidioidcs. 



