150 Minnesota Algae 



and distorted as if doubling up in the sheath; cells .6-2 mic. in length; cell 

 contents pale green. 



Rhode Island. On algae in high rock pool. Easton's Point, Newport. 

 December 1897. (Simmons). 



289. Inactis mexicana (Gomont) De Toni. Syll. Algar. 5: 356. 1907. Go- 



mont. Monogr. Oscill. 42. 1893. (Schizothrix mexicana 

 Gom.). 



Collins. The Algae of Jamaica. Proc. Am. Acad. Arts Sci. 37: 240. 1901. 



Plant mass continuous, soft, attached to submerged plants; filaments 

 very long, flaccid, floating in free tufts, with penicillate apices, twisted, 

 entangled, unbranched in lower portions, fasciculately branched above; 

 false branches somewhat appressed; sheaths very thin, papery, not lamel- 

 lose, somewhat roughened in outline; trichomes 6 mic. in diameter, con- 

 stricted at joints, in basal part of filament numerous within the sheath, 

 densely crowded, often twisted into a cord, in the branches few or solitary; 

 apical cell scarcely tapering, rotund; cells 2-5 mic. in length; transverse 

 v/alls commonly inconspicuous; cell contents showing scattered protoplas- 

 mic granules, pale violet (in dried specimens). 



Mexico. In Guatulco River. (Gomont). West Indies. On rock in 

 "Wag Water,'' Castleton, Jamaica. April 1893. (Humphrey). 



290. Inactis hawaiensis (Lemmermann) De Toni. Syll. Algar. 5: 357. 1907. 

 Lemmermann. Algenfl. Sandwich.-Inseln. Bot. Jahrb. 34: 620. pi. 8. f. 



19. 1905. (Schizothrix havaiensis Lemm.). 



Plate VI. fig. 18. 



Filaments 8-38 mic. in diameter, solitary, growing in gelatinous mass 

 formed by other algae; false branches present; sheaths colorless, lamellose. 

 v/ith pointed apices; trichomes 1.5-2 mic. in diameter, not constricted at 

 joints, parallel or flexuous, one to four within the sheath; cells S-6 mic. in 

 length; transverse walls not granulated, almost invisible; cell contents filled 

 with vacuoles, pale blue-green. 



Hawaii. With other algae in hot water. Volcano Mauna Kea, Island 

 of Hawaii. (Schauinsland). 



Genus SCHIZOTHRIX Kuetzing. Phyc. Gen. 230. 1843. 



Plants living on moist earth or in water, or in inundated places, rarely 

 entirely aquatic; filaments forming erect or prostrate, Symploca-like fas- 

 cicles or a pannose stratum, rarely floating free; sheaths in the beginning 

 colorless, finally becoming yellowish brown, purplish pink or bluish. 



I Cells somewhat quadrate or shorter than the diameter. 



1 Plant mass thin, encrusted, often widely expanded or in tangled 

 tufts among other algae; sheaths colorless, very transparent; 

 trichomes 1-1.5 mic. in diameter, constricted at joints; cells some- 

 what quadrate S. hyalina 



