96 



where it occurs on the Islands, otlicrwise thc algologists would have 

 noticcd it. We fouiid some fresh. but sterile specimens driven asliore, 

 but in December Helgi Jonsson found some specimens with spikes, 

 whose fruits however, were not developed. 



Order LI. SPARGANIACEAE. 

 260. Sparganium affine Schnitzl.; S. natans, Rostr. p. 62. 



Not uncommon in small lakes on most of the istands visited by 

 us; grows also some way up the hills, e. g. Bord 6: Skaarene, at some 

 375 m. (!) and Str.: Vardebakken, at some 300 m. (!). 

 Fl. end of Juh'. Fr. end of August. 



It generally flowers, but as a rule bears fruit very sparingly; we 

 found a greater number of spikes with fullj^ developed fruit only at 

 San (16: the small lakes near Saltvigsvatn and Ost: the lake near Ejde. 



III. Gymnosperniae. 



Order LII. PINACEAE. 



261. Juniperus communis L. var. nana (Willd.) Loud. 



Str.: Glj^versrejn (R., Jone Isacsen); Vaago: near Sorvaagsvatn (R.); 

 Ost.: near Svinaa (!), and according to verbal information on Havnatinde 

 on Svin 6. 



It has only been met with in these widely distant localities, but 



formerly it was more common ; thus it is usually found in peat-bogs, 



fairly large stems often occurring. The faet of its perhaps having been 



used as fuel on these treeless Islands may account for its present rarity. 



Fr. (ripe) about September Ist. 



IV. Pteridophyta. 



Order LIIl. EQUISETACEAE. 



262. Equisetum arvense L. 



Common in low-lying regions, but not in the hills. Occurs in nu- 

 merous different forms; thus, large forms peculiar to shady piaces 

 {i. nemo rosa A. Br.) are found in ravines; robust forms peculiar to sunny 

 piaces (f. agrestis Klinge), and small prostrate forms on stony margins 

 of lakes; in high water the latter becomes a submerged form and has 

 then secund suberect braiiches, as, e. g., on Str.: in Leinumvatn. 

 Bearing spores in the beginning of May. 



263. E. heleocharis Ehrh. f. limosa (L.). 



Rather rare in lakes and larger streams; Str.: Kvalvig (R.), Kvivig (L.), 

 in the stream at Orerenge(!); Syd.: Kvalbo (R.), in ditches at Famien (!), 

 Porkere (R.), in the lake in Vaags Ejde (Simmons, !). 



It is doubtless tliis species whicli Landt calls'E. hyemale, as is also men- 

 tioned 1)}' Ljngbye on his lal)els. 



