Myxophycese, Rivulariacese, Rivularia. 655 



haud facile secedentibus ; trichomatibus 4-7 [j.. crassis, olivaceis, 

 in piluni productis; articulis subquadratis; sporis*l-4 decimillim. 

 longis, 9-15 [j.. crassis, vagina cum tegumento proprio sporae con- 

 creta. 



Hah. ad phmtas subniersas, nonnunquam Ubere natans in aquis 

 trauquillis Sueciai (A.reschoug, C. et J. Agardh, Wittrock, Ngrd- 

 STEDT, Trybom), Scotisg (West), Britannite (Harvey, West), Hiber- 

 nia^ (West), Danioe (Lyngbye, Rosenvinge, Rosenberg, Drejer), 

 HollandicHe (West, Suringar), Belgii (De Wildeman, Flahault), 

 Galliaj ( Bornet , Flahault ) , Germania? (KiiTziNG, Al. Braun, 

 Richter, Schruder, Royers, Lemmermann, Kirchner), Poloniae 

 (LopoTT, Raciborski, Alexenko, Cybulski), Fennioe (Elfving), 

 RossicC (IwANOFFj, GalicitG (Gutwinski), Bosnise (Proti§), Helvetife 

 (Wartmann, Schinz, Winter, Theobald, Waldvogel, Forti), Au- 

 stricie (Grunow, Loitlesberger, Stockmayer, Hansgirg, Beck), 

 Bohemice (Hansgirg), Hungarise (Grunow) in lacu Balaton (Ist- 

 vanffi), Italia3 superioris (Meneghini, Martel, De Toni, Gar- 

 BiNi, FoRTi, Mach, Passerini), Americse foederatae (Wolle, Far- 

 low, Nelson, Gardner, Kincaid, Tilden, Kuntze, Bessey), Japoniiie 

 (SuRiNGAR, VoN Martens, De Toni), Brasilise et Indiae orientalis 

 (herb. Lenormand) Australise (Nordstedt), ins. Azoricarum (Boh- 

 lin) et ins. Madagascarite (West). — Obs. Clari Rabenhorst , 

 Kirchner et Hansgirg varietates plures discernunt singulis vete- 

 ribus speciebus respondentes q. sunt : Var. a typica Kirchn. Alg. von 

 Schles. p. 222: strato pisiformi, molli, Itevi, adhaerenti; heterocy- 

 sta, cellulis 1-3-plo crassiori. — Var. p Lens (Menegh.) Hansg. 

 Prodr. II, p. 45 (= Rivularia Lens Menegh. = Gl. Lens Endl.): 

 strato lenticulari, intense serugineo vel olivaceo-viridi vel viridi- 

 nigrescente. — Var. y solida (Richt.) Hansg. loc. cit. (= Gloeo- 

 trichia solida Richt. Phykot, Univ. n. 83! Ber. d. Naturf. Ges. 

 zu Leipz. 1886, Notarlsia 1887, p. 348: strato ad mm. crasso, cellu- 

 lis vegetativis basalibus 7 [j.. diam., 7-10 [j.. longis, sporis 12-14 

 [1. diam., 60-120 [j.. longis. — In Boheniia (Hansgirg) et Germania 

 (Richter). - Var. 5 viilosa (Kuetz.) Kirchn. (= Rimlaria villosa 

 (Kuetz.) Rab., Physactis villosa Kuetz. Tab. Phyc. II, t. 60): strato 

 superficie scabrescente villoso. — Var. s saccata (Roem.) Kirchn. 

 Alg. Schles. p. 222 (= Physactis Pisum [3 saccata Rab. Alg. exs. 

 n. 36) : strato crasso, saccato, ssBpe irregulari, libere natanti. — Var. 

 C durissima Kirchu. loc. cit. : strato ad mm. diametro, vaginis paulo 

 latioribus quam in typo, heterocystis cellulis basalibus sesquilatio- 



