1919] Setchell-Gardner : Myxophyceae 87 



Hauek, Meeresalg. Deutschl., 1885, p. 515, fig. 231 ; Setchell and 

 Gardner, Alg. N.W. Amer., 1903, p. 181. 



The type of Pleurocapsa fuligitiosa Hauck was collected at Trieste 

 and has been examined by us as mentioned above. Further remarks 

 on this type will be found under P. entophysaloidcs S. and G. The 

 result of our study has been to retain the Seattle plant under this 

 name, for the present at least, since it resembles the type material veiy 

 closely. We did not, however, find any of the larger colonies described 

 and figured by Hauck and the cells, with thick teguments, measure 

 up to 30/Li in diameter, which is half again greater than the maximum 

 measurements given by Hauck. For reasons given later we feel 

 uncertain as to the exact form and development of the gonidangia 

 and gonidia in this species. 



2. Pleurocapsa gloeocapsoides S. and G. 

 Plate 5, figs. 15, 16 



Colonies associated into soft, glistening, gelatinous masses, 1-2 mm. 

 thick; cell divisions regularly in three planes; cells globose when 

 single, angular from mutual pressure in colonies; protoplast 4-8/i, 

 diam., homogeneous, pale blue-green ; cell wall conspicuous, brownish ; 

 colonies of 2-8 cells enclosed in an ample, homogeneous, hyaline, soft, 

 gelatinous tegument; gonidia 2-4 formed in unchanged vegetative 

 cells, 2.5-3.5/* diam. 



Growing on a water-soaked log, at the margin of a salt marsh. 

 Alameda, California. 



Setchell and Gardner, in Gardner, New Pac. Coast Alg. Ill, 1918a, 

 p. 465, pi. 39, figs. 15-17. Gloeocapsa crepidinum Collins, Ilolden and 

 Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1151 (not of Thuret). 



The material of the above mentioned distribution was collected in 

 1913 in the same locality in which the type material of /'. gloeooap- 

 soides was collected in October, 1917. The gonidia, if present in the 

 original collection, were overlooked, and the close resemblance of the 

 species in the vegetative stage to Thuret 's Gloeocapsa crepidinum, so 

 well and amply figured in Bornet and Thuret (Notes Algol. I, 1876, 

 pi. 1), led the authors of the above mentioned exsiccatae to place it 

 in that species. Now that well formed, typical gonidia are found in 

 great abundance it has seemed best to remove it from the Chroococ- 

 caceae and place it in tlic Chamaesiphonaceae, if we are to adhere 

 to tlie well recognized distinction between these two families. The 



