156 Myxophycese, Oscillatorieee, Oscillatoria. 



n. 1995! (var. fusca) nec aliorum. — Trichomatibus terugineis 

 aut plus minusve olivaceo-viridibus, in stratum nigro-airugineum, 

 siccitate frequenter atro chalybeum agglomeratis, rectis, siccitate 

 rigitlis et fragilibus, haul torulosis, 11-20 •!. crassis, apice rectis, 

 non aut vix et breviter attenuatis, haud capitatis; articulis diametro 

 trichomatis 3-6-plo brevioribus, 2-5 \x. longis; dissepimentis fre- 

 quenter granulatis; cellula apicali superne convexa membranam 

 paululum incrassatam praebente. 



Hab. aquas quietas vel lente fluentes Norvegite (Lyngbye), 

 Lapponioe (Wittrock), Suecice (A.gardh, Wittrock, Noedstedt, 

 SiMMONS, LAaERHEiM), Dauiae (Lyngbye, J. Schmidt etc), ins. Fionine 

 (Hornemann), Batavite (Suringar), Angli;e (West), ins. Faeroensium 

 (Boergesen), Hibernite (West), Belgii (Bory, De Wildeman), Gal- 

 lioe (Bory, Vaucher, Desmazieres, Lenormand, Brebisson, Grate- 

 Loup, Demangeon, Libert, Draparnaud, Bornet, Mougeot, Go- 

 mont), Germaniie (Rabenhorst, Kuetzing, Kirchner, Braun, Lem- 

 MERMANN, 0. Zacharias, Royers, Schroeder etc), Bohemife (Karl, 

 Hansgirg, Schroeder), AustricB (Loitlesberger, Beck, Brunntha- 

 ler), Hungarise (Markus, Filarsky), Italise (Pollini, Meneghini, 

 Zanardini, Strapforello, De Toni, Martel, Zanfrognint, Mach, 

 Forti, Garbini), HelvetijTB (Naegeli, Vaucher, Waldvogel, Forti, 

 Lozeron, DiiGGELi etc), Bosnise, HercegovinsB (Gutwinski, Kar- 

 linski, Stookmayer), Albanise (Forti), Romaniae (Istvanffi), Po- 

 lonise (Cybulski, Lopott, Gutwinski), Rossise (Dorofiepf, Riabi- 

 NiNE, IwANOw, Alexenko), cataractse «Kerka» Dahiiatite (Frauen- 

 feld), Lusitanite (Welwitsch), Indise (Turner), Sibiriae (Koz- 

 lowski), ins. Ceylonse (West), Africte borealis (Sauvageau, De- 

 bray), Sierra Leone (Welwitsch), lacus «Nyassa» et prope «Ruli- 

 wa» Afr. centr. (FiiLLEBORN, Schmidle), Americse foederatse (Wolle, 

 Anderson, Farlow, Collins, Holden, Weber, Bessey etc), Argen- 

 tinte Amer. mer. (Wille), Brasiliiie (Loefgren), Fuegi;ie (Borgej; 

 in p;eninsula Lefebvre Australise (F. von Mueller, Moebius). — 

 Var. fuscescens Rab. Krypt. Fl. von Sachsen p. 89, Fl. Eur. 

 Alg. II, p. 105, nec alibi : strato fuscescente; trichomatibus rectis, 

 ad apicem obtusum parum attenuatis, diam. 5,8-7 [a. crass.; arti- 

 culis diam. trichomatis sub;iequalibus. Cum typo (Rabenhorst). — 

 V;ir. amethysteo-chalybea Kuetz. Sp. Alg. p. 244, Rab. 1. c p. 106: 

 strato c;erulco-chalybeo, trichomatibus asrugineo-chalybeis, crispatis, 

 7 [J.. crassis. In Gallia (De Brebisson). — Var. circinata Rabenh. 

 Fl. Eur. Alg. II, p. 106: trichomatibus hete ;erugineo-viridibus. 



