MR JOHN RATTRAY ON ECTOCARPUS. 591 



Ces filaments sont tres nombreux, et occupent la meme place que les sporanges 

 ovoides, qu'ils accompagnent parfois : plus ordinairement neanmoins, on ne 

 trouve ri, la meme epoque que l'une ou l'autre forme de fructification sur le meme 

 individu. Les zoospores issus de ces deux organes offrent une parfaite ressem- 

 blance. Seulement ceux qui proviennent des sporanges filamenteux sont un 

 peu plus grands que ceux qui s'echappent des sporanges ovoides. J'ai vu 

 d'ailleurs germer les uns el les autres, ce qui prouve suffisament leur complete 

 identite." 



J. E. Areschoug * finds " Oosporangia " and Trichosporangia in Ectocarpus 

 littoralis, Harv., and in E.fasciculatus, Harv. 



J. G. AGARDHt describes the fruits of Ectocarpus as consisting of (1) 

 spherical or ovate sessile sporse or sporidia, enclosed within a hyaline peris- 

 porium, and (2) of motile sporidia — the sporidia being spherical or ovato- 

 ellipsoidal capsules. He also describes pod-like propagula. 



Kutzing | figures in Ectocarpus fasciculatus unilocular forms of fruit as 

 " spores," and multilocular as " spermatoidia," the latter, according to Professor 

 Perceval Wright, being very like parasitic Chytridial growths. He also repre- 

 sents, according to Professor Magnus, Chytridial parasites as " intercellular 

 spores " of various Callithamnia. 



C. Gobi§ figures "Oosporangia" and Trichosporangia in Ectocarpus 

 approximatus v. balticus, Kutz. 



W. G Farlow II notes that the so-called " oosporangial "fruit of Ectocarpus 

 has not hitherto been observed in America, although the trichosporangial form 

 is well known. 



Harvey,1F as pointed out by Professor Wright, represents the round or 

 elliptical sessile " utricles " or " spores," which have been recognised as " oospor- 

 angia," as outgrowths of cells in Ectocarpus crinitus, E. pusillus, E. granulosus, 

 and E. sphwrophorus. 



Pringsheim,** while figuring (Taf. ix. fig. 7) the terminal portion of a branch 

 of Sphacelaria olivacea v. cwspitosa, Dillw., which has become invaded by 

 parasitic Chytridial cells, also represents (Taf. ix. fig. 9, c) certain cells which 

 have enlarged into a rounded ball-shaped form, which he calls " Brutzelle," but 

 the exact interpretation of these structures he leaves undecided. " Die sonder- 



* J. E. Areschoug, Algce Scandinavian exsiccatce, serei novce, Feb. 4, 1862. 



t J. G. Agardh, Species, Genera, et Ordines Fucoidearum, Lundee, 1848, p. 14. 



% Kutzing, Tab. Phyc, vol. v. pi. 50, ii. 



§ C. Gobi, "Die Brauntange des Einuiscben Meerbusens," Mem. de VAcad. Imp. des Sci. de 

 Petersbourg, sept, serie, tome xxi. No. 9, 1874. 



|| W. G. Farlow, "List of the Marine Algae of the United States," in Proc. Amer. Acad, of Arts 

 and Sciences, vol. x. 2nd series, p. 351, 1875. 



% Harvey, loc. cit. 



** Pringsheim, " Ueber den Gang der morphologischen Differenzirung in der Sphacelarien-Reihe.," 

 Abhandl. d. Konigl. Akad. der Wiss. zu Berlin, 1873. 



