Phaeosporales. 



Ectocarpacese. 



Pylaiella Bory. 



P. litoralis (L.) Kjellm. 



* opposita Kjellm. f. typica Kjellm. 



Not uncommon in the litoral region, sometimes in great masses. Fuegia: 

 Beagle Channel, Ventisqueros Inlet (St. 43, 5. 3. 09, sp.), on boulders in brackish 

 water, also in the upper sublitoral; Slogget Bay, on rocks (St. 47, 16. 3. 09, sp.); 

 Admiralty Inlet, Hope Bay, on sand (St. 13, 25. 3. 08, sp.). The form from St. 47 

 is rather like f. crassiuscula Kjellm., the tufts only about 1 cm long. Falkland 

 Islands: Stanley Harbour, very numerous on small stones (St. 1, 3. 11. 07, sp.). 



f. rigidiuscula no v. f. — Pusilla, obscura, 1 — 2 cm. älta, subrigida, firme penicillata, 

 ramis 40— 55 fi crassis, ramulosa, ramulis 20 — 30 [j- crassis rectis, angulo acuto exeun- 

 tibus, brevis vel brevissimis, apice subacutis, alternis (ssepe aggregatis) vel oppositis; 

 sporangiorum catenae in ramulis subterminales vel terminales; sporangia subglobosa, 

 40 — 50 [i crassa, interdum longitudinaliter di visa. — Fig. 1 a, 2 a. 



Fuegia: Slogget Bay, in tide-pools on Cladosteplius and Scytothamnus (St. 47 , 

 16. 3. 09, sp.). — This does not agree with any of the described forms; it bears 

 some resemblance to f. ramellosa (Kutz.) Kuck., but the position of the sporangia 

 is more as in P. varia Kjellm. 



* divaricata Kjellm. 



Near f. prcetorta Kjellm., but with shorter branches. A very delicate form, 

 thickest filaments only about 20 jx. Branches sometimes opposite, often under right 

 angle, not tapering. Colour very dark brown. — Patagonia: Otway Water, Puerto 

 Toro, in beach drift on Cladostephus (St. 16 b, 15. 4. 08, sp.). 



f. botryoclada nov. f. — Intricate caespitosa, tortuosa, parcissime ramulosa, filis 

 majoribus 30 — 40 ^ crassis, articulis diametro gequilongis — duplo longioribus; ramulis 

 brevibus, simplicibus vel ssepe brevissime et irregulariter fasciculatim ramellosis. 

 Sporangia intercalaria vel in ramulis terminalia, breve cylindrica, interdum ambitu sat 

 irregularia, filis paulum latiora. Gametangia in individuis distinctis eodem loco quam 

 sporangia evoluta, filis aequilata, nonnumquam subtuberculata. — Fig. 1 b-d. 



Fuegia: Ushuaia, in shallow tide-pools (St. 46, 14. 3. 09, sp. & gt.). — This 

 form looks quite peculiar and rather unlike other varieties. The branching is much 

 the same as in P. varia, but no botryoid branchlets have been observed in this and 

 the sporangia are different. Gametangia and sporangia were observed on different 



