10 CARL SKOTTSBERG, MARINE ALGiE 2. RHODOPHYCE^. 



Pusilla caespitosa, 1 — 2 cm älta, sat mollis. Discus basalis magnus tenuis, frondes 

 dense caespitosas emittens. Fröns ambitu cuneata, repetitcr nec non fastigiatim vel 

 irregulariter di-polychotome pinnata, teretiusculo-complanata, segmentis simplicibus 

 vel lobatis et furcatis, linearibus vel anguste cuneatis vel (saltem tetrasporiferis) anguste 

 lanceolatis, acutis, 0,3 — 1, majoribus usque ad 1,5 mm latis. Structura anatomica 

 generis. Cortex sterilis monstromaticus, cellulae subcorticales 1 — 3-stratosae, majores, 

 arcte repletae, medullares maximae, plerumque 1 — 2-stratosae, subhyalinae. Sporangia 

 in segmentis junioribus crassioribns numerosissima, filis sterilibus (cellulis corticalibus 

 radiatim seriatis) cincta. Cystocarpia et spermatangia ignota. 



South Patagonia: Arauz Bay, abimdant together with Bostrychia and 

 Catenella in the litoral region (St. 23 a, 3. 5. 08, ©). Falkland Islands: Cape 

 Pembroke, on Mytilus in tide-pools (St. 3 a, 7. 11. 07). 



Owing to the present state of confusion in the genus Gracilaria, it is indeed no 

 pleasure to describe a new species, the more as no cystocarps ha ve been found. Nothing 

 in the structure or general habit speaks against placing it with Gracilaria, and I do not 

 think it is identical with any other species of that genus. There is of course a possibility 

 that it has been described as Gymnogongrus, a genus including a considerable number 

 of obscure forms. In any case, Gracilaria pulvinata has long been ludden in herbaria 

 under a wrong name. Hohenacker's Dumontia fastigiata var. minor from Port Stanley 

 (no. 282) is identical with my plant. J. Agardh mentions these specimens in Sp. Alg. 

 III, p. 540, adding that the small form differs from Bory's plant and has cruciate tetra- 

 spores, and there is a specimen in his herbarium (no. 32592), on which he has written: 

 »vix est planta Boryi». In spite of Agardh's statement Hariot registered no. 282 

 under Chaetangium fastigiatum, with the remark that he had seen the same from Ker- 

 guelen in Hooker's collection. I do not know the latter plant. Cotton Crypt. Falkl. 

 p. 176 writes: »Hohenacker's Dumontia fastigiata var. minor Exsicc. 282, from the East 

 Falklands, is, in the British Museum set, a small specimen only, but clearly not referable 

 either to Dumontia or Chaetangium ». 



Distribution: S. Patagonia (first record), Falkl. 



Rhodymeniaceae. 



Dendrymenia nov. gen. 



Thallus sympodialis e stipitibus teretibus et laminis expansis compositus, sed 

 adparenter caulis percurrens folia flabelliformia lateralia sessilia primo disticha gerens. 

 Hapterae valde ramosae more Lessoniarum nidum formantes. Structura anatomica 

 ut in Khodymenia. Cystocarpia in foliis sparsa, ± distincte apiculata vel subcoronulata. 



I), flabellifolia (Bory) Skottsb. comb. nov. ± Fig. 3 d— f . 



Syn Rhodymenia flabellifolia (Bory) Mont. Voy. Bonite p. 105, Howe, Mar. Alg. 

 of Peru p. 124, pl. 49. 





