Myxophycese, RivulariaceEe, Rivularia. 673 



11. 198, Limnactis dura Rabenhorst Algeii n. 2B5 non n. 554, 

 nec 1451! nec Trevisan (fide Borneti) Limnactis ScJinurmanni 

 Fisch. Beitr. zur Kenntn. der Nostoch. etc. pag. 20, fig. 8, Al. Br. 

 in Rab. Alg. exs. n. 771! Fl. Europ. Algar. II, pag. 210, Kuetz. 

 Tah. phyc. II, pag. 21, t. 66, Limnactis flagelliferaRsih. Alg. exs. 

 n. 928! Kuetzing Tab. phyc. II, p. 21, tab. 65, fig. II, Dasyactis 

 pulchra Bruegg. Buendn. Alg. p. 264 (?), Zonotrichia pulchra Fl. 

 Eur. algar. II, pag. 217, Schizosiphon Rabenhorstianus Hilse in 

 Rabenhorst Algen n. 18361 Rivularia radians Thuret Ess. p. 382, 

 Kirchn. Algenflora von Scliles. pag. 223, excl. var. dura et Lyng- 

 hyana Nordst. in Wittr. et Nordst. Alg. exs. n. 275! Rivularia 

 radians var. minutula Hobbe ap. Wolle in Bulletin of tlie Torrey 

 botanic. Chib, VIII, pag. 38, 1881. — Frondibus globosis vel he- 

 misphiericis, interdum confluentibus, usque ad 8 mm. latis; filis 

 laxe consociatis, pressione facile secedentibus; vaginis amplis, 27 

 [j.. crassis, lamellosis, repetite ocreatis; ocreis in modum infundi- 

 buh sursum dihxtatis, hyalinis vel fuscescentibus; trichomatibus 

 9-12,5 ;j-. crassis, articulis inferioribus subquadratis, superioribus 

 diametro 3-4-plo brevioribus, gerugineis, in pilum crassum, brevi- 

 articulatum sensim attenuatis ; heterocysta oblonga vel hemi- 

 sphaerica. 



Hah. ad plantas, terram et lapides in rivulis, lacubus et stagnis 

 torfaceis Norvegia? (Witteock et Nordstedt), Fennic"e (Elfving), 

 Poloniie (Kozlowski, Raciborski), Danite (Rabenhorst, J. Sch- 

 midt), AnglicB (Carrington, G. S, West), Germaniae (Al. Braun, 

 Kuetzing, Reinsch, Schmula, Schrceder, Kirchner, Brand), Hol- 

 satiae (Lemmermann), GalHa^ (Brebisson, Bornet et Flahault), 

 Helvetia3 (Naegeli, DuggeliI), Austriae (Grunow, Heupler, Zu- 

 kal), Galicia3 Gutwinski), Bosniae (Protic), Bohemicie (Hansgirg), 

 Hungariae passim et in lacu Balaton (Istvanppi), Bulgariae (Pet- 

 kofp), in lacu « Langsee » prope «Kufstein» Tyroliae (Hansgirg) 

 et passim in ipsa regione (Heupler), in Istria (Hauck) in lacu Be- 

 nacensi Ital. super. (Garbini) et in America foederata (Hobbe, 

 WoLLE, WooD, Farlow, Collins, Kunze ). — Var. Orsiniana 

 Menegh. in Kuetz. Sp. p. 336, Limnactis Orsiniana (Menegh.) Rab. 

 Fl. Eur. Alg. pag. 211, Limnactis rivularis Kuetz. Sp. pag. 894: 

 strato liemisphcerico, magnitudine seminis sinapeos asquante, atro- 

 virenti, subduro, nitenti; trichomatibus gracilibus, aerugineis, di- 

 stincte articulatis, basim 4,2-4,7 |j.. diam., in apicem piliformem, 

 inarticulatum, achroum attenuatis; vaginis valde ampliatis, aureo- 



43 



