1918] dardner: Xew Pacific Coast Marine Ahjac 111 461 



the cells above the surface layer are very generally spherical, appar- 

 ently independent, and very variable in size. They appear rather to 

 be gonidia in various stages of development, that have eoint- to rest 

 on the surface layer, or in some cases seem to have grown in position 

 where they were formed. The cell walls are (piite gelatinous, which 

 is conducive to liolding the colonies together. 



Xenococcus Cladophorae (Tilden) Setchell et Gardner comb. nov. 



Plate 38, fig. 8 



Strato nunc plus minusve continuo. unistratoso, nunc in grege 

 parvo consociatis cellulis forma variabilibus. angulatis, prismaticis 

 spliaeroideis aut pyriformibus, 8-15/x, usque ad 22,u diam.: parietibus 

 conspicuis. hyalinis, homogeneis, saepe dififluentibus : cytioplasmate 

 liomogeneo, dilute coeruleo-viridi ; gonidangiis cellulis vegetativis in 

 forma magnitudineque similibus; gonidiis divisionibus iteratis for- 

 matis, 1.5-2^ diam. 



Plants forming a more or less continuous layer one cell deep, or 

 occasionally associated in small groups; cells variously shaped, angular, 

 prismatic, spheroidal or pyriform, 8-15/x, occasionally 22;U. diam. ; 

 cell walls prominent, hyaline, homogeneous, often diffluent ; proto- 

 l)last pale blue-green, homogeneous; gonidangia the same shape and 

 size as the vegetative cells ; gonidia formed by successive divisions of 

 the protoplast, 1.5-2ju, diam. 



Growing on (Jladophora sp. in tide pool, Baird Point, Strait of 

 Juan de Fuca, British Columbia. 



Pringshcimia scutata f. CladopJiorar Tilden, Amer. Alg. (Exsicc), 

 no. 382, tvpe. Chlorogloca tubcrcidosa Setchell and Gardner, Algae 

 N. W. Amer.. 1903, p. 182 (in part) ; Tilden, Minn. Alg., 1910, vol. 1, 

 p. 46 (in part). 



So far as I am able to discover on the available specimens of 

 Cladopkora distributed by Miss Josephine Tilden under no. 382 of 

 her American Algae, there are no epiphytes present belonging to the 

 Chlorophyceae. On the contrary there is a mixture of species belong- 

 ing to the Myxophyceae. 



One of these, a very sinall-ccllrd form, very sparse in the distribu- 

 tion belonging to Professor Setchell, as suggested by Setchell and 

 Gardner (1903, p. 182), seems to be closely related to Chlorogloca 

 tubercidosa (Hansg.) Wille. The material is too sparse and scattered 

 to admit of a very positive determination as to what species it really 

 may be. There are also groups of well defined vegetative cells of a 

 species of Pleurocapsa. -ludging from its present vegetative stage 

 it seems to be undescribed. There are, however, no gonidangia that 

 I have been able to discover, and as the material is verj^ scanty I for- 



