Tilden — Notes on a Collection of Algie from Guatemala. 155 



Nodularia harveyana. 



Nodularia harveyana (Thwaites) Thuret, Ann. Sci. Nat. Bot. VI, 1: 378. 



L875. 



Plants slender, 4-5 mic. in diameter, attenuate at ends, terminated by 

 an obtusely conical cell; sheath extremely delicate, hyaline, distinct ; cells 

 before division equal to or a little longer than diameter; heterocysts sub- 

 quadrate, somewhat longer than wide, of the same' width as the cells; 

 gonidia somewhat globose, yellowish-dark-colored (in this material bright 

 seruginous, probably immature), 5-8 mic. in diameter. Associated with 

 Phormidium valderianum. Laguna, LakeAmatitlan; altitude 3,950 feet. 

 W. A. Kellerman (no. 4304), February 8, 1005. 



Anab.iMia tins aqua-. 



Anabsena flos-aqux (Lyngb.) Bri'b. in Br§bisson & Gody, Algues des en- 

 virons de Falaise, 36. L835. 



Colonies frothy, gelatinous, floating; plants circinate, 4-8 mic. in dia- 

 meter; cells spherical-compressed, 6-8 mic. in length; heterocysts a little 

 larger than ordinary cells; gonidia curved, oblique, 7-13 mic. in diameter, 

 20-35 mic. long, near the heterocyst. Associated with Microcystis flos- 

 aquse and Eudorinaelegans. Lake Amatitlan. 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, L906. 



Stigonema ocellatum. 



Stigonema ocellatum (Dillw. ). Thur. Ann. Sci. Nat. Bot. VI, 1 : 380. 1875. 



Csespitose, pannose, tomentose, dark-colored; plants erect, 3-8 mm. 

 high, irregularly branched ; branches long, straight, patent, scarcely more 

 slender than primary filaments, 35-45 mic. in diameter; sheath thick, 

 lamellose, hyaline or yellowish; cells of varied sizes, in one or two rows, 

 bluish-green, 20-30 mic. in diameter; heterocysts rare, lateral. Growing 

 on edges of steam-holes on side of Volcano Santa Maria, near Lake Atit- 

 lan. VY. A. Kellerman. (no. 5070), February 3, 1906. 



CHLOROPHYCE/E. 



Spirogyra sp. 

 Spirogyra sp. ; sterile. 



In pool near river. Rio Michatoya. W. A. Kellerman (no. 5050) Jan- 

 nary 25, 1906. 



Spyrogira sp. ; sterile. 



In still water. Lake Amatitlan, south end. W. A. Kellerman (no. 

 5062) January 28, 1906. 



Pleurococcus vulgaris. 



Pleurococcus vulgaris Menegh. Nostoch. 38. no. 6. pi. 5. 1846. 



On cedar planks at edge of lake. Lake Amatitlan. W. A. Kellerman 

 (no. 5066), February 1, 1906. 



