AIASSEE : MARINE ALG^ OF SCARBOROUGH. 



30T 



ZOOSPORE.-E. 



Chlorochytrium immersum sp. nov. 



Cells elliptical, depressed ; neck short ; zoospores elongate 

 pyriform, with two cilia about three times the length of the body, 

 springing from the colourless anterior end ; posterior end with 

 bright green chlorophyll grains. 



Endophytic on Schizo7te??ia dillwynii Callithafnnion roseum. 

 When crowded the cells are irregular in shape, but when solitary, 

 elliptical ; sunk in the substance of the matrix, from which the 

 short neck — through which the zoospores escape — protrudes ; 

 at first filled with bright green chlorophyll, which eventually breaks 

 up into zoospores. 



The genus was founded by Cohn for the reception of a 

 species — C. lemnce — found at Breslau, growing in the thallus of 

 Lem7ia trisulca. (' Ueber parasitische Algen von Dr. Ferdinand 

 Cohn.' Beitrage zur Biologie der Pflanzen. Bd. I. s. 87. 

 Tafel II. 1870.) 



A second species — C. coJmii — was described by Dr. Wright in 

 the Transactions of the Royal Irish Academy (Vol. 26, Part 8, 

 1878), parasitic on various species of Schizonema, Polysiphonia, 

 &c., also on infusoria, from which the present differs in the shape 

 of the cells and the biciliate elongate pyriform zoospores, all of 

 one size, and containing chlorophyll. Conjugation was not actually 

 seen, but after remaining in motion for some time they came to 

 rest, and assumed a spherical form, when some were observed 

 of larger size, presumably the result of conjugation. 

 TTlva. — The arrangement of species proposed by Le Jolis in his ' Liste 

 des Algues Marines de Cherbourg ' is followed. It will be 

 observed that the genera Ulva and Enteromorpha are united. 

 XJlva lactuca L. ( = Ulva latissima Harv.) 



Ulva enteromorpha Le Johs ( = TJlva linza Harv., Enteromorpha 



intestinalis Harv., Enteromorpha compressa Harv.) 

 Chsetomorpha melagonium Kutz. ( ^ Conferva melagonium 

 'Web. et Mohr.) 



South Bay at low-water mark. 

 Cladophora arcta Dillw. 



Rocks, South Bay. 

 Cladophora lanosa Roth. 

 Cladophora rupestris L. 

 Cladophora laetevirens Dillw. 

 Cladophora fracta Fl. Dan. 



Scalby Beck, where it empties into the sea. 



Aug. 1885. • ., ' 



