496 A. HESSELBO 



Nenr Thingvcllir it grew on a soil-covered rock-ledge in a cleft, 

 in association wilh Eucalijx snhellipticns, Baiiramia ilyphylla and Pohlio 

 criida. All the specimens found were (^ piants. 



190. Philonotis seriata (xMitt.) Lindb. 



E. Iceland: BerufjordurI; Seydisfjordur!; Kirkjubol (H. J.)!. N. Icc- 

 land: Husavik!, at an elevation of 200— 300 metres; several piaces near 

 Eyjafjordiir (O. D.;!): Myvatn (Grl.)!; common in Oxnadalur!. NW. Ice- 

 land: Veiy common by all the fjords from D>rafj6rdur northwards!. 

 W. Iceland: Frodarheidi (H. J.!; Esja, many piaces!. S. Iceland: Selja- 

 land (Stp.)!. 



GroNvs on inundated ground, as a rule in the water itself, for in- 

 stance along streams and in moss bogs. 



In NW. Iceland it is one of the most frequently occurring species, 

 and is met with abundanth' up to a height of above 400 metres above 

 sea-level. It often forms in association with Pohlia albicans, Scapania 

 iiliginosd. Haplozia cordifolin and Chiloscyphus polyanthiis v. fragilis the 

 main portion of the moss-carpet along streams. In the other parts of 

 the country — with the cxception of S. Iceland where it has been found 

 only near Seljaland -- it is rather common. It is usually met with from 

 about 250 to 500 metres above sea-level, but frequently asccnds up to 

 about 600 metres, for instance by Berufjordur. The fruit, which was 

 quite green even in the first half of July, has been found onl}' in a few 

 localities in the district of Isafjordur and near Ejjafjordur, and only 

 scantily. 



191. Philonotis tomentelia Mol. 



P. alpicola Jur. 



Widely distributed over the whole of Iceland. 



P. lomentella usually prefers drier localities than does the closely 

 allied P. fontana. In N. Iceland. whcrc it is ver}' common, it grows 

 abundantly everywhere on partially dr}', grass-covcred ground, and is 

 easily distinguished from P. fontana by its more slender growth and by 

 the extremely dense tufts, with stems covered with brown tomentum 

 almost to their sum mit. It grows, also, both on rather dry and on 

 damp rocks and on wet bogg\^ ground in Company with P. fontana, with- 

 out, however, extending into the water itself 



It varies very considerably in habit and size. The leaves are more 

 or less falcato-secund, and forms especially from dry rocks have leaves 

 strongly falcato-secund ff falcata). In shady localities, for instance in 

 rock-clefts and caves, slender to almost thread-like forms (var. capillaris) 

 are frequently met with. Forms growing in bogs are more vigorous. 

 than are those growing on a dry substratum, and are also less densely 

 tomentose. 



On damp rocks and in humus-filled rock clcfts there frequently oc- 

 curs a slender form with numerous slender, easily falling branches which 

 probably serve for vegetative propagation (f. ftagcllifcrd). 



Limpricht (Kryptogamenflora. vol. II. p. 573) records that the 



