560 A. HESSELBO 



ing masses of rock (holt) occur scattered. In the wettest parts of 

 the myri grew Hypnum scorpioides, H. giganteum and some H. re- 

 volvens v. Cossoni. The moss-covering of the ground between the 

 knolls consisted mainly of Hypnum revolvens, H. stellatum, H. Lind- 

 bergii, H. stramineum, Acrocladium cuspidatum, Hypnum polygamum, 

 Hylocomium squarrosum, Camptothecium nitens, Mnium Seligeri, M. cin- 

 clidioides, Philonotis fontana and Bryum ventricosum, all of which grew 

 intermixed. Of more scanty occurrence were Hypnum sarmentosum, 

 Paludella squarrosa, Meesea trichoides, M. triquetra, Cinclidium stygium, 

 Mnium punctatum, Splachnum vasculosum , S. sphcericum, Fissidens 

 osmundoides, Oncophorus Wahlenbergii, Alicularia scalaris and Aneura 

 pinguis. The following hepatics grew both between and upon the 

 knolls: Lophozia Kunzeana, L. quinquedentata, Scapania irrigua, 

 Cephalozia pleniceps, C. bicuspidata and Cephaloziella Hampeana. 

 The knolls were usually formed by Sphagna, especially by S. teres, 

 S. Warnstorffti and S. rubellum, and in very wet parts of the m\ri 

 also by S. medium. Woven into and above the Sphagnum-cushions 

 grew Hypnum uncinatum, Hylocomium squarrosum , H. proliferum, 

 H. parietinum, Climacium dendroides, Aulacomnium palustre, Dicra- 

 num scoparium var. turfosum, Ptilidium ciliare, Plagiochila asplenioides, 

 and, uppermost, Rhacomitrium hypnoides and R. canescens. 



2. Hoskuldstadr in E. Iceland. Knolly sedge-bogs with a 

 rich vegetation of mosses between the knolls, along the river at the 

 bottom of the valley. The moss carpet of the ground between the 

 knolls consisted of Hypnum revoluens, H.giganteum, H. stellatum, Acro- 

 cladium cuspidatum, Mnium cinclidioides, Cinclidium stygium, Mnium 

 affine var. elatum, Paludella squarrosa, Philonotis fontana, Meesea tricho- 

 ides, M. triquetra, Bryum ventricosum, Aulacomnium palustre, Catoscopium 

 nigritum, Oncophorus Wahlenbergii, Dichodontium pellucidum and 

 Aneura pinguis. All the Bryophyta, as a rule, grew intermixed, 

 but some of them frequently formed large, pure growths, especially 

 Catoscopium nigritum and in the wettest parts Mnium cinclidioides 

 and Cinclidium stygium. Upon the knolls, which were sometimes 

 formed by Carex, sometimes by Sphagnum, grew Camptothecium ni- 

 tens, Thuidium lanatum, Hypnum stramineum, H. uncinatum, Hylo- 

 comium squarrosum, Sphagnum teres, S. Warnstorffii , and, upper- 

 most, Hylocomium parietinum, H. proliferum , Dicranum scoparium, 

 Rhacomitrium hypnoides and Scapania curta. Woven into the moss- 

 covering, especially into that upon the knolls, were found Lophozia 

 Kunzeana, L. quinquedentata, Scapania irrigua, Blepharostoma tricho- 



