252 Howe : Phycological studies 



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

 the cells of Siphonocladus rigidus, X 39°- 



Figures I, 4-7, and 9-1 1, have been drawn from our no. 1597 (Key West, 

 Florida) ; figs. 2 and 3 from no. 2771 (Cutler, Dade County, Florida) (similar branch- 

 ing, however, can be found in no. ijQ7) ; and fig. 8 from no. 3046 (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 (no. S3 22 )- Tne 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. 



