38 University of California Publications in Botany [Vol. 6 



distal outgrowths on the cells of other Coelastraceae such as Coelastrum 

 camhricum. The cell- wall is thin, with an exceedingly thin trans-' 

 parent gelatinous film upon the surface. The protoplasm is applied 

 immediately to the wall. The chromatophore is peripheral, very pale 

 light green in color, with numerous minute pyrenoids. The nucleus 

 is centrally located. 



No trace of the methods of reproduction has been found. 



The relationships of this organism are with the family Coelas- 

 traceae, subfamily Sorastreae and the genus Coelastrum, within which 

 both hollow and solid coenobia are included, though the latter are less 

 usual. The Coelastraceae are separated by Wille, in his "Nachtrage" 

 to Engler and Prantl, from the Hydrodictaceae on the basis of the 

 absence of zoospores in the former. No evidence is at hand upon this 

 point with regard to the organi.sm here described, so that its allocation 

 in Coelastraceae is provisional in so far as this character is concerned. 

 Its structural relations are with both of these families in the matter 

 of coenobium and surface differentiation in the cells, but the form 

 of colony and type of cell protrusion is somewhat more like that of 

 the Coelastraceae and it may therefore be provisionally assigned to 

 that family. 



Phytomorula gen. nov. 

 Coenobio solido, subcomplanato ; cellulis, 16, firmiter adherentibus. 



Phytomorula regularis sp. nov. 



Coenobio solido, subcomplanato, orbiculato, cellulis 16, firmiter 

 adhaerentibus in coenobio, 8 alternantibus in peripheria, 4 ad polum 

 pertinentibus utrimque, superficie gibbosa, 15/i, in lohgum, 30/x in 

 latitudine, cellulo lO/x in latitudine. 



Transmitted April 2, 1914. 



