Myxophyoeae, Rivulariacese, Calothrix. 623 



tiuscula, heterocystis intercalaribus rarissimis; horuiogoniis in va- 

 giua oodem teuipore paucis, diainetro 3-plo longioribus. 



Hab. ad terraui, muros, ligua, saxa in locis humidis vel iuun- 

 datis, etiam subsalsis per Belgium (Douret, Mathieu), Galliam 

 (Lamy de la Chapelle, Bornet et Flahault), Angliam, Hiber- 

 niam (West), Germaniam (Kuetzing, Braun, Grunow, Rabenhorst, 

 Apstein, Kirchner, Royers, Lemmermann), Helvetiam (Naegeli, 

 Cramer); iu lacubus Consta-Uite, Lemano et Benaco (Kirchner), 

 in Austria (Hansgirg, Beck, Schiedermayr), Bohemia, Bosnia, Dal- 

 matia, Carinthia, Carniola, Istria, Tyrolia (Hansgirg, Kravogl, 

 Protiq, Schmidle), Galicia (Gutwinski), Hungaria (Filarszky), 

 Bosnia et Hercegovina (Gutwinski, Beck, Stockmayer), Italia (Ce- 

 SATi, Hauck, Del Torre), Sardinia (Marcucci, Piccone), Norvegia 

 (Foslie), Suecia (J. Agardh, Lagerheim), ins. Bornholmia (Liebman), 

 Fennia (Elfving, Levander), Algeria (Debrayj, ins. Azoricis (Boh- 

 lin), ludia (Hansgirg), America boreali (Farlow, Kunze, Tilden;, 

 Australia (Nordstedt, Schmidle), Groenlandia (Richter) et insulis 

 Sandwicensibus (Hitckock). — Obs. CI. Hansgirg (Prodr. loc. cit.) 

 formas plures discernit q. s. : p salina (Kuetz. p. p.) Hansg. in W. et 

 N. exs. n. 696: strato circ. 1 mm. crasso, minime mucoso, brun- 

 neo-nigro; filamentis plerumque simplicibus vel pseudoramosis, 

 apice fastigiato-elongatis, ex vaginis achrois vel brunneo-aureis evi- 

 denter stratosis, apice infundibuktis egredientibus, 9-18 ]s.. diam.; 

 cellulis diam. 2-4-pIo loiigioribus. — y sabullcola {= Schizosiphon 

 sabulicola A. Br.) : strato luteo vel nigro-brunneo; filamentis 

 sparse ramosis; cellulis apice filorum plerumque contentu rufo 

 farctis; vaginis initio apice clausis, deinde apertis. — S pluvlalis 

 (= Mastigonema pluviale A. Br.): strato subtili, filamentis bre- 

 vibus, saepius simplicibus, apicem versus rufo-roseis. — s csespitosa 

 (Kuetz.) Hansg. (= Mastichonema ccespitosum Kuetz.): strato 

 plerumque globoso, membranas nigro-bruuneas iu saxis fingenti; 

 filis simplicibus, 4-9 [x, crassis; vaginis tenuibus, inconspicue stra- 

 tosis; heterocystis s^epe deficientibus. — C decolorata: strato sor- 

 dide rufo-brunneo; filamentis plerumque vaginis achrois praeditis, 

 Siaepe trichomata superantibus. — Var. thermalis G. S. West On 

 some Alg. from hot Springs in Journ. of Bot. 1902, p. 243, t. 439, 

 f. 17-20: vaginis subcrassis, achrois, sublamellosis et non ocreatis 

 setate provecta lutescentibus, 11-19 |j.. diam. ; articulis 6,7-11,5 [x. 

 crassis, diam. plerumque sequalibus vel interdum 2-pIo brevio- 

 ribus; heterocystis basilaribus et latis. — In saxis et rupibus fon- 



