158 Vnivevsilij of California Publications in Botany [Vol. (5 



{Algae of the Arctic Sea, p. 282, pi. 27) two kinds of branches occur, 

 but the short ones do not form a separate generation, but occur on 

 long branches of all orders. They become transformed into sporangia ; 

 Kuckuck calls them "fertile Kurztriebe" ("Beitrage zur Kenntnis 

 der Ectocarpus-Arten der Kieler Fohrde, " Botan. Centralhl., 48, 1891, 

 p. 38) . The erect filaments of the Bachelotia species sometimes branch 

 again, but the branches then are of the same nature as the filaments 

 themselves ("ramis sparsis conformibus erectis, " Bornet, /. c, p. 8). 

 Finally, when short basal branches are described in P. Hooperi these 

 evidently are of the same kind as the more or less short branches, 

 emitted from the creeping filaments in P. fulvescens and described 

 and figured by Sauvageau ("Note sur 1' Ectocarpus {Pilayella) ful- 

 vescens Thuret," Journ. de l)ot., 10. 1896, pp. 166-167). But they are 

 not much like the well-defined system of branchlets we have met witli 

 in the new species. According to my opinion, it deserves to be placed 

 in a separate subgenus, for which I have chosen the name Pantho- 

 carpus, thus wishing to express the remarkable fact that the whole 

 plant minus the basal parts is used up for reproduction. 



Pylaiella Bory subg. Panthocarpus nov. subg. 



Fila erecta numerosa, simplicia vel ima basi furcata. interdum in 

 parte dimidia superiore ramulis brevibus sparsis regulariter oppositis 

 ornata. Sporangia plurilocularia terminalia, longe catenulata. e trans- 

 formatione filorum ramulorumque orta, multiseriata. Sporangia uni- 

 locularia ignota. Pili non inveniuntur. 



'ti-" 



P. Postelsiae n. sp. 



Syn. Leptonema fasciculatmn Saunders non Reinke 



Dense caespitosa, obscure fusca, ad 10-12 mm. alta. Fila primaria 

 radicantia, rhizoideis praedita ramosa, ± endophytica. 8-10/^. crassa; 

 secundaria erecta longissima, simplicia vel sparse ramulosa. Cellulae 

 basales cluplo longiores quam latae (12-15/^ diam.), infimae membrana 

 crassiore et interdum rhizoideis praeditae, ceterae 15-20^ diam. et 

 2-4plo longiores quam crassae, dein breviores et ad septa leniter con- 

 strictae. Ramuli breves vel brevissimi. oppositi, obtusi. sub angulo 

 e. 60 — 80° egredientes. Sporangia plurilocularia 21-23/1, diam.. sporae 

 4-5/x. 



llal). ad oras Californiae in truncis foliisque Postelsiae palmae- 

 fonnis Rupr. (1). A. Saunders, W. A. Setchell, C. Skottsberg). 



Pylaiella Postelsiae represents a rather primitive type among the 

 Ectocarpaceae. The special development of the basal parts excepted, 

 there is hardlv aii\- differentiation in the thallus. The short branches 



