164 Kansas Academy of Scierice. 



Family III. Ch^tophorace^. 

 Key to the genera of Chsetophoracese. 



A. Fronds erect with differentiated base and apex. 



* Fronds less than 1 mm. high, tips not acute nor setiferous 



1. Microthamnion. 

 * * Fronds larger, tips generally acute or setiferous, filaments 

 practically free, 

 o. Fascicled ramuli different in character from stem. 



2. Draparnaldia. 

 b. Stem, branches, and ramuli little differentiated 



3. Stigeocloniwm. 



1. Micr-othamnion. 



SS. M. Kuetzingianum Nageli. 

 Kansas: Olathe, April, 1916. 

 Nebraska (3); Missouri (11). 



2. Drapamaldia. 



89. D. giomeyuta (Vauch) Agardh. Plate IV, fig. 27. 

 Kansas: Neodesha, November, 1915. 

 Nebraska (25); Colorado (15). 



3. Stigeoclonium. 



Ken to l^pecieft. 



I. Opposite branching predominant; filaments 11-30 mic. in diam; 

 lower cells usually longer than broad; ramuli sharp-pointed 



S. lubricum. 



II. Alternate branching predominate, filaments short, tufted, 7-9 mic. 



in diam., ramuli scattered, tips setiferous S. sestivale. 



90. S. lubricum (Dilliv.) Kuetz. 

 Kansas: Atchison, November, 1915. 

 Missouri (11). 



91. S. sestivale Hazen. Plate IV, fig. 28. 

 Kansas: Galena, December, 1915, April, 1916. 

 Missouri (11). 



Order V. SIPHONOCLADIALES. 



The only family of the Siphonocladiales in the reservoirs was the 

 Cladophoraceje of which Cladophora was the only genus found. 



1. Cladophora. 



Key to Species. 



I. Fronds permanently attacked to substratum. 



A. Ramuli in dense terminal clusters straight or slightly curved. 



1. Lower branching mostly dichotomous; branches connate for 

 some distance; main filaments 85-120 mic. in diam. 



C. canalicularis. 



2. Branching mostly alternate; branches not connate, 75-100 



mic. in diam C. glomerata. 



B. Ramuli not in dense terminal clusters. 



1. Frond not over 1 cm. high; filaments about 40 mic. in diam. 



C. uberrima. 



2. Frond larger, 10-40 cm. high; filaments 75-125 mic. in diam. 



C. callicoma. 



92. C. canalicularis (Roth) Kuetz. 

 Kansas: Independence, December, 1915. 

 Nebraska (24); Missouri (11). 



