Myxophyceae 149 



tan Park Commission, Massachusetts. 126. 1896. Collins, Holden and 



Setchell. Phyc. Bor.-Am. Fasc. 5. no. 206. 1896. 



Filaments forming a' very thick, trunk-shaped basal portion; false 

 branches short. 



Massachusetts. On stones along the margin of Spot Pond, Middlesex 

 Fells; on stones at the water's edge, Peabody, Suntaug Lake, August iBgo; 

 Tynnfield, Suntaug Lake, September 1890. (Collins). 



286. Inactis austini Wolle. Fresh Water Algae. III. Bull. Torr. Hot. Club. 



6: 183. 1877. De Toni. Syll. Algar. 5: 351. 1907. 



Plant mass somewhat hemispherical, plano-convex, 3-7.5 mic. in diame- 

 ter, often aggregated, diffluent, brown becoming blackish green; filament.s 

 firm, cylindrical; more or less branched, growing in tufts; sheaths colorless, 

 very close; cells two or three times longer than broad; transverse walls 

 usually distinct; cell contents dark blue-green. 



New Jersey. Wet rocks. Little Falls. 1867. (Austin). 



287. Inactis tinctoria (Agardh) Thuret. Essai Class. Nostochinees. Ann. 



Sci. Nat. Bot. VI. i: 379. 1875. Gomont. Monogr. Oscill. 41. pi. 7. 



f. 5-7. 1893. (Schizothrix tinctoria Gomont.). De Toni. 



Syll. Algar. 5: 356. 1907. 

 Wolle. Fresh Water Algae. III. Bull. Torr. Bot. Club. 6: 183. 1877. 

 (Hydrocoleum tinctorium A. Br.); Fresh Water Algae. Bull. 

 Torr. Bot. Club. 6: 282. 1879. (Hypheothrix tinctoria Rabenh.) ; 

 Fresh-Water Algae U. S. 321. pl. 208. f. 16. 1887. (Leptothrix tinc- 

 toria Kg.). Bessey, Pound and Clements. Additions to the Reported 

 Flora of the State. Bot. Surv. Nebraska. 5: 13. iQOi. 



Plate VI. fig. 17- 



Plant mass continuous, soft, mucous, attached to submerged plants, 

 blue-green or violet; filaments very long, flaccid, floating in free tufts, with 

 penicillate apices, unbranched in lower portions, branched above; sheaths 

 narrow, not lamellose, somewhat diffluent; trichomes 1.4-2.4 mic. in diame- 

 ter, especially constricted at the joints, in basal part of filament numer- 

 ous within the sheath, more or less spirally twisted, in the branches few 

 and straight; apical cell rotund; cells 1.4-3 mic- in length. 



Pennsylvania. On aquatic plants. (Wolle). Nebraska. On C 1 a d o- 

 phora. Fisher's Lake, Glen Rock. (Bessey, Pound and Clements). 



288. Inactis simmonsiae (Collins) De Toni; Syll. Algar. 5: 356. 1907. 



Collins, Holden and Setchell. Phyc. Bor.-Am. Fasc. 15. no. 707. 



1900. (Schizothrix simmonsiae Collins). Collins. New 



Species etc., issued in the Phycotheca Boreali-Americana. Rhodora. 



8: 105. 1906. 

 Plants living in salt water; plant mass forming a brownish tufted 

 coating on various algae (showing reddish brown when moistened, pinkish 

 under the microscope); tufts 1-2 cm. long; sheaths thin, distinct; trichomes 

 3-6 mic. in diameter, much constricted at joints, usually single within the 

 sheath, but often several in basal portion, sometimes irregularly swollen 



