Myxophyceae 25 



Plate I. fig. 34-36. 



Plant mass rose-colored to red, thick, cushion-like, widely expanded, 

 encrusted with lime on the under side; cells somewhat spherical or elongate, 

 2 mic. in diameter, 3-5 mic. in length; sheath thick. 



Hawaii. On sides of lagoon. Island of Laysan. (Schauinsland). 



Genus GLOEOTHECE Naegeli. Gatt. Einz. Alg. 57. 1849. 



Colonies embedded in a common gelatinous tegument; cells cylindrical- 

 oblong, rounded at the ends, each surrounded by a wide mucous homogene- 

 ous or lamellose sheath; reproduction by transverse division of the cells in 

 one direction only. 



I Individual sheaths colorless 



1 Cells .8-2.5 mic. in diameter, 10.5-18 mic. in length 



G. linearis 



2 Cells 1.6-3 mic. in diameter, 2.2-7.5 mic. in length 



G. confluens 



3 Cells 4-5.5 mic. in diameter, 6-15 mic. in length G. rupestris 



4 Cells 4-5 mic. in diameter, 6-10 mic. in length G. membranacea 



5 Cells 2.5-2.7 mic. in diameter, 4.8-5.7 mic. in length, somewhat crescent- 



shaped with acute apices G. lunata 



II Individual sheaths partly or entirely colored 

 I Plant mass usually free-floating 



(1) Sheaths colorless at margins; cells 3-4 mic. in diameter 



G. magna 



(2) Sheaths usually brownish or yellowish; cells 4-5.5 mic. in diameter, 



6-1 1 mic. in length G. fuscolutea 



57. Gloeothece linearis Naegeli. Gatt. Einz. Alg. 58. 1849. De Toni. Syll. 



Algar. 5 : 62. 1907. 

 West and West. On some Freshwater Algae from the West Indies. 

 Journ. Linn. Soc. Bot. 30:276. 1895. 



Plate II. fig. I, 2. 



Plant mass gelatinous, dull yellow becoming reddish; plants 9.5-10.5 

 mic. in diameter, 10.5-18 mic. in length; sheaths very wide, colorless, hyaline, 

 oblong or somewhat reniform; cells .8-2.5 mic. in diameter, 10.5-18 mic. in 

 length, linear-cylindrical, straight or curved, usually single; cell contents 

 pale blue-green or green. 



West Indies. On damp wall of dam, Sharp's River, St. Vincent. (Elli- 

 ott). 



58. Gloeothece confluens Naegeli. Gatt. Einz. Alg. 58. pi. i G. f. i. 1849. 



De Toni. Syll. Algar. 5:60. 1907. 

 WoUe. Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 182. 1877; 

 Fresh-Water Algae U. S. 325. pi. 210. f. 6. 1887. Collins. Algae of Mid- 

 dlesex County. 16. 1888. WoUe and Martindale. Algae. Britten's Cata- 

 logue of Plants found in New Jersey. Geol. Surv. N. J. 2:610. 1889. 



