496 A. HESSELBO 



Near Thingvellir it grew on a soil-covered rock-ledge in a cleft, 

 in association with Eucalyx subellipticus, Bartramia ityphylla and Pohlia 

 cruda. All the specimens found were <$ plants. 



190. Philonotis seriata (Mitt.) Lindb. 



E. Iceland: Berufjordur!; Seydisfjordur!; Kirkjubol (H. J.)!. N. Ice- 

 land: Husavik!, at an elevation of 200300 metres; several places near 

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

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

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



land (Stp.)!. 



Grows 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 abundantly up to a height of above 400 metres above 

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

 uliginosa, Haplozia cordi folia and Chiloscyphus polyanthus v. fragilis the 

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

 the country with the exception 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 ascends 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 only in a few 

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

 scantily. 



191. Philonotis tomentella Mol. 

 P. dlpicola Jur. 



Widely distributed over the whole of Iceland. 



P. tomentella usually prefers drier localities than does the closely 

 allied P. fontana. In N. Iceland, where it is very common, it grows 

 abundantly everywhere on partially dry, grass-covered 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 summit. It grows, also, both on rather dry and on 

 damp rocks and on wet boggy 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 (f. falcatd). 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 drv substratum, and are also less densely 



o o - 



tomentose. 



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

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

 probably serve for vegetative propagation (f. flagellifera). 



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



