521 



p. 316) found his Finmark spermiens in 10—20 l'alhoms attached 

 to Lithothamnion soriferum and corals , and the doubt he expresses 

 as to the identity of Mie Finmark and the Færoese plant on account 

 of their diflferent habitats is now cleared away by the discovery of 

 niv sublittoral plant. He linds further cause for doubt in the faet 

 of his plant being 1 — 1,5 cm. high only, while Lyngbye records 

 his to he »circa pollicem allns , bul liere again, I mav mention 

 thai some of niv speeimens were also ahout 1 cm. high only, while 

 others were almosl an inch high. With regard then lo the sub- 

 stratum Derbesia marina grows on, this appears to he very dif- 

 ferent, Lyngbye found il on rocks, Kjell man on Lithothamnion 

 and corals, and I on Balanus and Serpula, and, lastly, I mav add 

 that al Lerwick on the Shetland Islands 1 I found il at a depth of 

 ahont 6 l'alhoms, epiphytic upon the slem of Laminaria hyperborea 

 where it occurred as a short cushion ahout 3 /4 indies high. 



The Færoese as well as the Shetland plant agreed well with 

 Kjellman's exhaustive description. I shall in what follows point 

 out some of their most important characters. In hoth piants there 

 usually occurred one short cell at the hase of each branch — most 

 frequently in the English specimen — and a similar short cell in 

 the stalk at the hase of the sporangium. The erect branches were, 

 at their thickest, as much as ;"H n lliick in the plant from the Færoes, 

 and somewhat thinner, ahout 50 fi in the English one. Sporangia 

 occurred in both of them, but unfortunately I did not observe anv 

 which were quite ripe. Those in the Færoese speeimens were ahout 

 160 u long and 75 /< broad, while those in the Shetland speeimens 

 were ahout 150 ,u long and 70 /i broad. A similar immature spo- 

 rangium in the specimen gathered by Lyngbye measured 156 /* 

 in length and 67 /< in hreadth. The stalks of the sporangia vary 

 considerably in length, as mentioned by Kjellman (1. c. p. 10); 

 those which I examined varied in length from 20 — 60 ,«. The spo- 

 rangia, as I said before, were not fully ripe, so, unfortunately I 

 cannot record with anv certainty how many swarmspores are pro- 

 duced in each sporangium, but they were, however, sufficiently deve- 

 loped for me to ascertain that the number would undoubtedly be 

 at least 20. 



1 This year on my way to the Færoes I was enahled to pay a short visit to 

 the Shetland Islands, as the Marine Department not only kindly allowed me to 

 make the voyage to the Færoes in the cruiser »Beskytteren«, hut also permitted 

 the latter to touch at the Shetland Islands. 



