Vol. XXI, pp. 153-156. June 9, 1908 



PROCEEDINGS /&\£~A 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON ^*-J 



3 R 



NOTES ON A COLLATION OF ALG/E FROM 



GUATEMALA. 



BY JOSEPHINE E. TILDEX. 



While engaged in collecting plants, more particularly rusts, 

 in the neighborhood of Lakes Amatitlan and Atitlan, Guatemala, 

 Dr. VV. A. Kellerman and Mr. A. L. Smith, both of the Ohio 

 State University, made a collection of alga' which was sent to 

 me for study. The following list of species is the result of my 

 work . 



MYXOPHYOCE^E. 

 Microcystis flos=aqu£e. 



Microcystis flos-aquse. (Wittr.). Kirchn. in Engler and Prantl, Nat. 



Pflaiiz. 1, la. 50, f. 49 N. 1900. 



Cells 4-15.5 mic. in diameter, globose, densely aggregated to form solid 

 or clathrate, oblong or elliptical colonies; colonies up to 175 mic. long. 

 Associated with Anabsena flos-aquse and Eudorina elegans. Lake Ama- 

 titlan. Temperature of water 73°. " Very abundant." Collected with 

 a surface net. W. A. Kellerman (no. 5034), S. E. Meek, and A. L. 

 Smith, January 14, 1906. 



Oscillatoria boryana. 



Oscillatoria boryana Bory., Diet. 12:465. isi'7. 



Stratum dark chalybeous; plants forming a regular spiral through 

 their entire length, flexible, slightly constricted at joints, 6-8 mic. in 

 diameter, with an acute, non-capitate apex; cells 4-(> mic. long, showing 

 a few scattered granules; cross walls granular; apical cell rounded or 

 acute-conical; calyptra none. Forming a dark velvety mass in a small 

 stream of warm water, a little distance from a hot spring, on bank of 

 river. Altitude 3,950 feet. Rio Michatoya, near Lake Amatitlan. \V. A. 

 Kellerman (no. 5051), January 25, 1906. 



■lo— Proc. Biol. Soc. Wash., Vol. XXI, 1908. (153) 



