97 



264. E. palustre L. 



Common on (laiii|) f^rouiid in low-lying regions. A form parallel 

 lo the subnierged form mentioned nndcr E. arucnse was fountl by us 

 on Syd.: in the lakc in Vaags Ejde. 

 Bearing spores in May. 



265. E. pratense Ehrh. 



Rare, but possibly sometimes overlooked; Kalso: Mygledal (Lom- 

 holt), SyderdaU!); Kuno: soiithern end of the island at some 100 ni.(!); 

 Str. : Vestmanhavn (Kissmeyer); Syd.: Tværaa (!). 

 Bearing spores in Ma3\ 



266. E. silvaticum L. 



Common both in liixuriant ravines and in flelds, where it often 

 occurs in large quantities; not met with higher up the hills. 

 Bears spores probably at the same time as above. 



Milde (Filices Europaeae, p. 238) meiitions E. ramosissimiim Desf. from the 

 Færoes ; specimens are said to be found in Hookers Herbarium. But as it has 

 not been found since, it is just possible, either that the labels have been changed 

 or that some other similar mistake has occured; in the past sufficient care was 

 often not bestowed on details such as these. 



Order LIV. HYMENOPHYLLACEAE. 



267. Hymenophyllum peltatum (Poir.) Desv. ; H. Wilsoni Hook; 

 Rostr. 1. c. p. 7(>. 



Seems to be fairly common on the larger Islands; grows by pre- 

 ference in talus of débris forming below terraces of basalt-rocks together 

 with mosses, but sometimes also in the lower part of the basalt terraces, 

 in ravines and on detached pieces of rocks. 



We found it in many piaces on Syd., Str., Sando and Ost., but 

 on the Nordreoer we onlj^ met with it on Bordo: Klaksvig and Kalso: 

 Syderdal, though we looked out for it particularl3^ 



It does not spread higher up the hills than 2—300 m. (C. J., !). 

 Seems to be found with sporangiums the whole summer. 



Order LV. ISOETACEAE. 



268. Isoétes echinosporum Dur. 



Common in the numerous small lakes together with the following 

 species, but not found on Syd. (and Yaago?). 



269. I. lacustre L. 



Common in the lakes on all the istands visited by us. Strangely 

 cnough, earlier authors mcntion this two species only as occurring in a 

 few lakes, while we found them in every lake we investigated. 



The}^ grow from the shore out into the water to a depth of at 

 least 1^/2 m. , and the specimens increase in size with the depth; thus 

 the leaves of /. echinosporum from Saltvigsvatn measured 15 cm., and 

 the leaves of /. lacustre from a small lake at Næs 20 cm. 



Botany of the Færoes. 7 



