662 Myxophxcese, Rivulariacese, Rivularia. 



Engl. Bot. pl. 2911, Rab. Fl. Eiir. Alg. II, p. 208, Crouan Fl. du 

 Finist. p. 117, Alg. du Finist. n, 333! Lloyd Algues de l'Ouest 

 de la France n. 3041, p. p., non Harvey, Physactis plicata Kiitz. 

 Sp. Alg. p. 332, Tab. phyc. II, p. 19, t. 59, f. III, Zonotrichia 

 plicata Rab. Fl. Europ. Algar. II, pag. 221, 1S65. — Fronde 

 globoso-expansa, plicato-corrugata, olivaceo-virente, molli, usque 

 ad 3 cm. lata, cava; filis confertis, concretis, vix distinctis, sursum 

 ampliatis, hyalinis vel luteo-fuscis; trichomatibus cylindricis, 2-5 

 [X. crassis, olivaceis, in pilum tenuissimum longissime productis; 

 cellulis inferioribus diam. 3-4-plo longioribus, superioribus bre- 

 vioribus. 



Hah. ad terram humidam et rupes graniticas in locis subsalsis 

 inter plantas marinas Britanniie (Harvey, Ralfs, Batters), I*'on- 

 nia! (Elfving), Suecia? (Agardh), Dania^. (Flora Danica, Oersted, 

 RosENviNGE, Jacobsen, Mortensen, Lange, Johs. Schmidt), ad li- 

 tora maris Caspici (Wille), Belgice (Westendorp et Wallays), 

 Hollandia3 ad Ostendam (Dumont), Germanicie (Reinke), litoruiri 

 Atlautici Gallise (Bornet, Flahault), ins. Caprera (D' Albertis), 

 « S. Yincente de la Barquera Hispani* (Lazaro), ad « Leca » Lu- 

 sitaniffi (J. Newton), Mediterranei prope Constantinopolim (Thu- 

 ret), et Istrite (Hauck), ad littora Nova3-Angli;e (Pike, Farlow), 

 Nov;e Scotiie (Collins, Setchell), Alaska (Setchell) et Fuegia; 

 (Hariotj, Australia; «Rivoli Bay, Port Philip, Georgetown » (Har- 

 VEY, SoNDER, Muller), ins. Clarence in Fuegia (Hariot), King 

 Georg Sound (Sonderj. — Obs. - R. nitida, a cl. Piccone in Sar- 

 diiua observata, non est nisi Rivularia plicata Carm. forle var. 

 a cl. Marcucci in Unione Itineraria cryptogamica n. LIV distributa, 

 idest Rivularia mesenterica Thur. 



17. Rivularia Hansgirgii Schmidle in Hedwigia 1900, p. 173, t. IX, 

 f. 23-25 et in Kneucker^s Bot. Zeit. (1900), p. 34. — Stratis ex- 

 pansis, nostocoideis, gelineo-papyraceis, solidis, subtilibus, nigris 

 vel nigro-brunneis; filamentis longis, directione horizontali cresceu- 

 tibus, plerumque intricatis et curvatis, raro subparallelis, arcte 

 consociatis; heterocystis basalibus, singulis vel geminatis, hyalinis, 

 circa 8 [x. diam. pra^ditis, raro ramosis; ramis etiam heterocystis 

 basalibus ornatis; heterocystis interiectis rarissimis; filamentis 

 apicem versus lentissime attenuatis, crassitudine media ad 6 [a. 

 apice 2-4 {i. extremo achrois, evidenter torulosis, raro in appendicem 

 curtam, achroam filiformem exeuntibus; vaginis subtilibus achrois, 

 vel pallide luteolis, contentu granuloso, cellulis rectangularibus 



