Myxophyceae, Schlzotrlcheee, Hypheotlirix. 329 



t. GO, f. IV, Rab. Fl. Eur. Alg. II, p. 80. — Strato crustaceo, duro, 

 crasso, lapideo, superficie glauco-viridi, intus decolorato; tricho- 

 matibus intricatis, interruptis, distincte articulatis, serugineis, 4-7 [j.. 

 crassis; articulis diauietro ffiqualibus vel paulo brevioribus, geni- 

 culis hyalinis, interdum leviter contractis; vaginis arctis, achrois, 

 subfirmis. 



Hab. in solo tofaceo rivulorum Helvetia^ ad Turicum (Naegeli), 

 Italia3 (Rabeniiorst), Bosnitc, Hercegovinai (Gutwinski, Beck, Stock- 

 mayer). 



6. Hypheothrix aikenensis Wolle in Bull. of Torr. Bot. Cl. 1877, 803 

 p. 182. — Fihimentis tenacibus, curvatis, densissime intricatis, in 

 stratuin phis minus expansum consociatis, oHvaceo-viridibus; tricho- 

 matibus passim interruptis, Sc^epius moniliformibus; articulis diam. 

 subaequalibus vel usque 2-plo longioribus; contentu Isete rerugineo; 

 vaginis sat amplis, achrois, pellucidis, 8-11 [i. diam. 



Hal). in aqua dulci prope «A.iken, South Carolina» America? 

 borealis (Wolle). 



7. Hypheothrix puivinata Naegeli in Kuetz. Spec. p. 268, (1849), Rab. 804 

 Fl. Eur. Alg. II, p. 80, non alior. nec Schiz. pulvinata (Kuetz.) 

 Gom. — Strato parvo, pulvinato, compacto, superficie sordide cano- 

 viridi vel subolivaceo, intus decolorato; trichomatibus suberectis, 

 parallelis, flexuosis, interruptis, indistincte articulatis, pallide £eru- 

 gineis, homogeneis, 1,5-2,25 [t. crassis (c. vag. usque ad 5); vaginis 

 interdum amplissimis, homogeneis, achrois, pellucidis, haud raro 

 luteolis vel fuscescentibus. 



Hah. in lignis inundatis prope Turicum Helvetias (Naegeli) et 

 in stratibus calcareis prope « Krems » Austrite (Schiedermayr). 

 — b. COnfluens Kuetz. 1. c: pulvinulis in stratum irregulare con- 

 fluentibus. 



8. Hypheothrix tenax Wolle in Bull. of Torr. Bot. Cl. 1878, p. 282, 805 

 Leptothrix tenax Wolle Freshw. Alg. of U. S. p. 319, t. CCVIII, 



f. 2. — Strato late expanso, plus minus pulvinato, compacto, sor- 

 dide olivaceo-viridi; trichomatibus initio laxe flexuoso-curvatis, 

 deinde in membranam firmam vel pulvinatam dense intricatis, pal- 

 lide aerugineis ; articulis subasqualibus, saepius indistinctis non- 

 nunquam interruptis; vaginis achrois, subfirmis, 35-50, {i. diam. 

 Hat). in lapidibus submersis stagnorum Pennsylvanirc Amer. 

 Bor. (Wolle). 



9. Hypheothrix buliosa Wolle in Bull. Torr. Bot. CI. VI, 1877, p. 182, 806 

 LeplolIiPLc hullosa Wolle Freshw. Alg. of U. S. p. 321, t. CCVIII, 



