Myxophyceee, Scytonemacfese. ScytonemEi. 519 



bormiense Briigg. Biindn. Alg. p. 2(35, Hedwigia III, p. 58, Rab. 

 Fl. Eiir. Alg. II, p. 250, Anzi in Rab. Alg. exs. n. 2104! 2263! 

 Ardiss. in Erb. critt. it. II, n. 712! Scytonema gracillimum fornia 

 b. crassior Rab. Fl. Eur. Alg. II, p. 254, Scytonema gracillimum 

 forma c. terrestris Rab. FI. Eur. Alg. II, p. 254, Scytonema Myo- 

 chrous b. dimorphum Rab. Fi. Eur Alg. II, p. 254, Scytonema 

 chrysochlorum Rab. Fl. Eur. Alg. II, p. 255, Wartni. in Alg. oxs. 

 n. 1096!*Heufl. Enum. crypt. it. Ven. p. 139 nec Kuetz., Scytonema 

 Myoch7'OUS i. contextum Rab. Fl. Eur. Alg. II, p. 255, Scytonema 

 Myochrous Thur. Ess. de class. des Nostoch. p. 380 (1875), non 

 Agardh nec Rabenliorst, Scytonema chlorophceum Marcucci in Erb. 

 critt. it. ser. 11, n. 866 ! nec Alior., Scytonema gracile Braun in Ra- 

 benh. Alg. exs. n. 117, Al. Br. in Rab. Alg. n. 1842! Anzi in Erb. 

 critt. it. ser. II, n. 180! non Kuetzing nec Rabenh. Alg. n. 977! 

 et 2339!, Scytonema Myochrous var. tenuis De Not. in Erb. 

 critt. it. ser. I, n. 865!, Rab. Alg. exs. n. 2179!, Scytonema turi- 

 cense Franzoni in Erb. critt. ital. ser. I, n. 363 I non Naegeli. — 

 Strato pannoso, late longeque expanso, spongiaceo, tomentoso, fu- 

 sco-nigro vel nigro-virescente, filis tortuosis, intricatis, 2-4 mm. 

 altis, rarius cm. superantibus, 15-21 [j.. crassis; vaginis lamellosis, 

 parum ochreatis, luteo-fuscis, lamellis vix divergentibus in vertice 

 ultimse cellulae tenuibus; trichomatibus 6-12 (x. crassis, luteo viri- 

 dibus; articulis inferne longioribus cylindricis, superioribus di- 

 scoideis; heterocystis subquadratis aut dianietro longioribus, fuscis. 

 Hab. ad rupes humidas vel madidas, rarius ad muscos, in tur- 

 fosis et in aquis quietis insul. Faeroensium (Lyngbye, Wille, 

 Boergesen), Suecise (C. J. Agardh, Nordstedt, Wittrock, Lager- 

 heim), Norvegife (Hopmann-Bang, Nordstedt, Wille), Anglice (Ber- 

 KELEY, Bennett, West), Scotise, Hiberni;e (West), Galliae (Flahault, 

 BoRNET, Lamy), FennisB (Elfving), Bohemi;e (Hansgirg, Schroeder), 

 Helvetia3 (A. Braun, Itzigsohn, Kuetzing, Wartmann, Cramer) 

 lacus Bodani (Kirchner), Germaniai (De Bary, Kuetzing, Braun, 

 KiRCHNER, M. ScHMiDT, RoYERS, Rabenhorst), Austriie et Tyroliffi 

 (Schiedermayr, Stockmayer, Heufler, Hansgirg), Bosnioe (Protic), 

 Italice (Bornet, Bruegger, Ardissone, Martel, Kirchner, Forti), 

 SardinicB (Marcuccij, Dalmatia), Istriie (Hansgirg), Hispanite (Gru- 

 Now), Africae tropic* Angolae (Welwitsch, Goetze) et ad lacuni 

 Nyassa (Schmidle), Galicife (Gutwinskij, Polonise (Raciborski, Gru- 

 Now, Loitlesberger, Sauter), Americse foederatoe (Wood, Bailey, 

 Setchell, Wolle, Tilden, Farlow), dit. AIaskan:ie (Saunders), Ca- 



