families and inclosed by wide, colorless sheaths which are only 

 slightly lamellate; cells 2-4/x in diameter, with sheaths 4-8/a wide. 

 On shore and in tychoplankton of shallow lake. Mich., Wis. 



Gloeocapsa calcarea Tilden 1898, p. 29 



Plant mass light gray-green to blue-green, forming a calcareous 

 crust on moist substrates; cells spherical, in families of 4-16 indi- 

 viduals inclosed in thin, colorless sheaths, 6-9/a in diameter, with 

 sheaths 11-12/i, wide. 



On wet boards, Osceola, Wisconsin. 



Gloeocapsa punctata Naegeli 1849, p. 51 

 PI. 101, Fig. 7 



Plant mass blue-green, floating or entangled among other algae, 

 consisting of small aggregates of 4-16 individuals which are spher- 

 ical and inclosed by thick sheaths that are weakly lamellate out- 

 wardly but which break down and become confluent with the 

 colonial mucilage internally; cells 0.75-2.3jU. in diameter; contents 

 blue-green, homogeneous. 



This species mav be identical with G. aurata Stiz., a species 

 described as having yellowish envelopes that are not lamellate. 

 Sheath color and presence or absence of lamellatiQns seem to be 

 such variable characters that alone they are inadequate for the 

 separation of species. 



On soil and in tychoplankton of soft water lakes. Wis. 



Gloeocapsa rupestris Kuetzing 1845-1849, Tab. Phyc, 1, p. 17 



PI. 107, Fig. 13 



Plant mass dark-colored, brownish, encrusting; cells blue-green, 

 spherical, in few-celled colonies; cell sheaths thick and but slightly 

 lamellated, yellowish or orange-brown; cells 6-9/x in diameter; 

 families 15-75/a in diameter. 



Mich. 



APHANOCAPSA Naegeli 1849, p. 52 



A globular, ovate, or sometimes amorphous mass, gelatinous, and 

 free-floating, in which spherical cells are usually widely and evenly 

 distributed through a yellowish or hyaline, homogeneous colonial 

 mucilage; individual cell sheaths not evident; cells often in pairs 

 as a result of recent division; contents homogeneous or finely gran- 

 ular, pale gray-green to bright blue-green. See description of Micro- 

 cystis, page 455. 



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