252 Howe : Phycological studies 



II. Hyphoe of a fungus (?), which is apparently always found on the surface of 



the cells of Siphonocladus rigiduSy X 39^. 



Figures I, 4-7, and 9-1 1, have been drawn from our 110, i^gy (Key West, 

 Florida) ; figs. 2 and 3 from no. s'j'ji (Cutler, Dade County, Florida) (similar brandl- 

 ing, however, can be found in no. ijQj) ; and fig. 8 from no. 304b (Hog Island, 

 Nassau Harbor, New Providence, Bahamas). 



Plate 15. Petrosiphon adhaerens 



A photograph of formalin-preserved specimens collected in tide-pools on Silver 

 Cay, near Nassau, Bahamas, January 23, 1905 («(?. JJ-?^)- The plants were photo- 

 - graphed under an enlargement of I^ diameters in order to bring out better the radiat- 

 ing component tubes and this magnification is retained in the reproduction. The 

 darker mass just below the middle of the upper right-hand plant is made up of various 

 epiphytes. 



