103. M. Grefillei (Thur.l Wittr. , emend. K. Rosenv. Grl. 

 Havalg. p. 946, Deux. Mém. p. 117. 



a. typica K. Rosenv. Grl. Havalg. p. 947. 



Some few specimens of this variety have been collected. 

 The frond is 17 // thick, with somewhat thickened outer mem- 

 brane. 



ß. Vahlii (J. Ag.) K. Rosenv. Grl. Havalg. p. 949. 



Some small specimens of this variety have been collected; 

 they agree well with the description, are up to 10 cm. long, 

 with tubular frond. 



y. arctica (Wittr.) K. Rosenv. Grl. Havalg. p. 949. 



Besides typical specimens the collection contains plants 

 having an intermediate position between this and the following 

 variety; they are up to 45 cm. long, with the uppermost part 

 of the frond split into a few narrow segments, while the lower 

 part, about Va of the frond, is tubular. The thickness of the 

 frond is 43 // at a distance of 1 cm. from the base, in the 

 upper part the frond is somewhat thinner and thus measures 

 only 39// in the lower part of the segments. Such specimens 

 may as well be referred to one as to another of the named 

 varieties. 



o. intestiniformis K. Rosenv. Grl. Havalg. p. 952. 



Several typical specimens of this variety have been collected, 

 some of which are much larger than reported by Rosen vinge 

 (I.e.). The largest specimen of this collection is 130 cm. long, 

 while the largest plant measured by Rosen vinge is 53 cm. 

 long (I. c). The thickness of the frond, measured at about the 

 middle between the base and the apex of the frond, varies from 

 29 — 44 fi. A single fructiferous specimen was 44 /i thick at 

 the apex of the frond. As pointed out by Ros en vinge the 

 frond of this variety is not rarely split in its uppermost part. 



The species was gathered in June, July, and September, 

 with sporangia in June — July. 



