ALPINE FLORA AND FEKNS OF NORWAY. 317 



between them ; fronds alternate, lanceolate ; pinnae deeply 

 serrate, obtuse ; sori crowded in the middle, generally two-rowed, 

 but finally confluent. It bears fruit late in August." 



A. FILIX FEMTNA, Bernh. ; Fl. D. tab. 2,436. Common on 

 rather damp places in copses and forests to East Finmark. Grows 

 on the Fjelds up to and a little over the limit of fir. A luxuriant 

 form, frequently attaining a height of 3 feet, is found in small 

 valleys near brooks and rivers. Bears fruit from June to Sep- 

 tember. 



A. ADIANTUM NIGBUM, L. ; Fl. D. tab. 250. Occasional in 

 clefts of the rocks. Has hitherto only been found on the western 

 coast from Stavanger to Romsdal. Grows on Findbe and 

 Rennesoe, in Stavanger Fjord, and also near Stavanger. It 

 appears to thrive best on low grounds near the sea, and generally 

 on a substratum of granite. It bears fruit in the autumn. 



A. TRICHOMANES, L. ; Fl. D. tab. 119. Common in shady 

 places in clefts of the rock, as far north as Salten in Nordland, 

 probably higher. On the mountains it vanishes below the limit 

 of fir, and scarcely attains a higher altitude in the southern parts 

 of the country than 1,200 to 1,600 feet above the sea. Bears 

 fruit from July to September. 



A. VIRIDE, Huds. ; Fl. D. tab. 1,289. Bears a striking re- 

 semblance to the last. Occasional in clefts of the rocks, and in 

 moist shady places from the south 'of Aggershuus Stift, e.g., near 

 Porsgrund, Brevig, and Christiania down to the sea. More 

 frequent on Fjeld tracts up to East Finmark. It mounts np 

 above the birch-limit to about 3,500 feet above the sea. Bears 

 fruit at different times, according to altitude. 



A. SEPTENTRIONALE, Sw. ; Fl. D. tab. 60. Very common on 

 rocks, stone fences, walls, &c., up to East Finmark. Grows on 

 the Fjelds to same altitude as the last. Bears fruit according to 

 altitude. 



A. BREYNII, Retz. Not common. Grows on low ground, in 

 clefts of the rock. In Aggershuus Stift, Professor Blytt found it 

 near Laurvig, on Sandoe, Nordre Aaroe, Ustre Bolleren, Drobak, 

 on Ntesodden, near Helvig, near Ifcekkelag close to Christiania. 

 In Bergen Stift it has been found in Lcrdal ; also in Romsdal, 

 and on Korsvigberg, near Throndhjem. Generally found on 

 substrata of granite, lime, or slate. Bears fruit in July and 

 August. 



