224 Myxophycese, Lyngbyeae, Phormidium. 



ralda iii Notarisia II, 1887, n. 8, p. 333, Buscalioni Siille muffe 

 e suirHapalosiphon d. terme di Valdieri (1895), p. 3, t. V, f. 2, 

 Leptotlirix zonata Cesati in Rab. Alg. n. 577! (fide Gom.), Hy- 

 plieothrix zonata Rab. Fl. Eur. Alg. II, p. 78, Oscillatoria tener- 

 rima A. Br. in Rab. exs. n. 2458! (non Kuetz.), Hypheothrix co- 

 riacea Richt. in H. et Richt. Phyk. Univ. n. 29, non Kuetz. — 

 Strato lubrico, expanso, himelloso, fere 3 cm. crasso, lamellis dua- 

 bus, superiore sordide viridi, inferiore achroa composito ; filis 

 tlexuosis dense intricatis; vaginis arctis, papyraceis, demum in 

 mucum tenacem diffluentibus et agglutinatis, chlorozinc. jodur. c;e- 

 rulescentibus; trichomatibus lerugineis, apice rectis non attenuatis, 

 ad genicula haud constrictis, 2-2,5 jj.. crassis; articulis diam. lon- 

 gioribus, 3,3-6,7 [j.. longis; dissepimentis granulis binis vel qua- 

 ternis refringentioribus notatis; cellula apicali rotundata; calyptra 

 nulla. 



Hab. in aquis thermalibus aut frigidis Angliie (Boulger, "West), 

 Gallise borealis ad Domfront (Brebisson) et in Arvernia (Gomont), 

 Danife in insula Fionia (Hofman-Bang, Schmidt), Germanite ad 

 Berolinum (Braun) et per vallem Bielensem (Krieger), Austriae 

 ad Vindobonam (Grunow), Italite ad fontem Valderiam (Delponte, 

 Perroncito, Varalda, Buscalioni); in fonte quadam calida Lu- 

 sitaniie (S. Tavares); in Montenegro, Dalmatia, Hercegovina (Schmi- 

 dle); in insula Ceylon (West); in gulfo CaIifornia3 (Hariotj; in 

 Minnesota (Tilden), Nova Anglia (Collins), Rhode Island (Set- 

 CHELL et Gardner), Alaska (Saunders) et Connecticut Amer. bor. 

 (Setchell); in Numidia et Tunisia (Sauvageau); ad «Usafua» 

 Africae tropicce (Schmidle). 



15. Phormidium cebennense Gom. Sur quelq. Oscillar. nouv. in Journ. 

 de Bot. 1899, p. 38, t. I, f. 14. — Strato tenui, valde expanso, 

 pulchre aureo-fusco; filis tlexuosis, intricatis aut subrectis, paral- 

 lelitor dispositis; vaginis arctis papyraceis, demum in mucum dif- 

 fluentibus, chlorozincico jodurato haud cserulescentibus; trichoma- 

 tibus dilute fuscis, apice rectis, haud attenuatis, ad genicula non 

 constrictis, 2 (a. crassis; articulis diam. brevioribus, 1-1,5 [j.. longis; 

 dissepimentis non granulatis; cellula apicali rotundata; calyptra 

 nulhi. 



Hab. in lapidibus graniticis a^iu^e fontis conspersis in vico 

 «Libones» Cebennarum (Gomont). — Phormidio valderiano (Delp.) 

 Gom. species h;cc similis videtur. 



16. Piiormidium angustissimum W. ct G. S. West in Welw. Freshw. 



