40 



CARL SKOTTSBERG, MARINE ALG^5 1. PH^OPHYCE^. 



ing to the original description in Prodr. Phyc. Ant. p. 12 the superficial stratum 

 is formed by »filis clavatis simplicibus et articulatis basi sporam obovatam geren- 

 tibus». Nothing is said of cryptostomata. The articulated filaments probably belöna 

 to an epiphyte (compare under Myrionema incommodum) ; the obovate spores are the 

 sporangia. Kutzing's figure shows the strticture of Adenocystis. Låter (Voy. pöle 

 sud., p. 44) Montagne wrote that the spores were situated at the base of cylindrical 

 bifurcate and articulate filaments. There is nothing like this in Kutztng's figure, 

 which was prepared from type material; on the other hand, such a description an- 

 swers well to Myrionema incommodum. 



CL 



1» 



-<r 



Fig. 16. a — f Adenocystis utricularis : a smallest specimen found, in optical section, X 360; b another very young plant, 

 X 360; C — e young plants with terminal hairpits, X 25; f long. section through wall of large frond, showing formation of 

 assimilators and sporangia, X 180. g — h Utriculidium Durvillei: g origin of gametangia, X 360; h cross section, showing 

 sori and remaining sterile cells, X 5f> ; i part of cortex with traces of gametangia, X 360. 



The f. lonqissima cannot be due to external conditions as it grows mixed with 

 the ordinary form. Its genetic relations to this are obscure. At present I do not 

 feel inclined to give it the rank of a species. The identity with Chorda rimosa cannot 

 be ascertained without an examination of the latter. 



Different writers have assigned to Adenocystis a very different systematic posi- 

 tion. Oltmanns, Morph. und Biol. II p. 374 placed it in the vicinity of Colpomenia, 

 etc, while I preferred to let it form a suborder »Adenocystidese*, what of course 

 did not say more on the affinity than we knew before. Gain, Flore algol. p. 43, 

 has again removed it to the Laminariacese, where it had been placed before, ranging 

 next to Chorda. 



