

107 



caespitulus J. Ag., Eel, spinosus Ktz. mit Syncdra Gaillouii 

 Ehrb., Polysipbonia tlexella J. Ag., Plocaria dura Eudl., Aglao- 

 phyllum uncinatum Mont., Hildenbrandia fluviatilis Breb., Chroo- 

 lepus hercynicum Ktz., Lemanea torulosa Ktz. Flocci 

 spermatiferi conferte ramosi , arliculis eorundem ellipsoideis 

 pallescentibus: celluloe stratus interioris frondis amplissimae latere 

 interiore valde incrassatse. SSon JBojcn. Spirogyra inter- 

 media Rabenh. maxime vetusta. Ulothrix attenuata 

 concinna DNtrs. Laete virens. Tricbomata fasciculata, 

 deorsum attenuata, basi scutata adfixa, crassiuscula, subcarti- 

 laginea, superiori parte maturescendo subtorulosa, T $ 6 mm. 

 latit. aequantia. Articuli inferiores extenuati, diametro lon- 

 giores, reliqui diametro paullo breviorcs. Cellulae amylideae 

 primuni quadratics , dein plereeque septo medio transverse di- 

 visae, demum rofundaite, interstiliis ad unum quodque genicu- 

 him trigonis, latiusculis, extus, in planfa viva, scabridis. U. 

 speciosse Rabenh. Alg. (non Ktz.) valde similis, di fieri tricho- 

 malibus firmioribus. IL speciosa Ktz. ex specim. Ralfsiano, 

 ad Penzance lecto ex CI. BerkeL, ab utraque satis diversa. 



Rivularia Marcucciana DNris. n. sp. Subhemisphae- 

 rica, centro adfixa, gelatinosa , olivaceo-virescens, 1--2 mm. 

 lata, in sicco collabescens. Tricbomata radiatim expansa, alti- 

 tudine varia nascentia, distincte vaginala, dilute viridia, e cel- 

 lula basilari smaragdina primum moniliformi subulata, demum 

 manubrio tereti-oblongato, granuloso prtedita, elongato-flagelli- 

 formia, inlerrupte articulata, recta, vel varie flexuosa. Vaginae 

 juniores cyathilormes, demum elongata?, tubulosae, apice trun- 

 cato-ampliatae, transverse undulatae, lutescentes. lln Potamo- 



Swarcucci gtfammelt 



m 



Euactis Beccariana DNtrs. Kb sp. Humeeta con- 

 vexiuscula, mollis, mucosa, olivaceo-virens, vix zonata, millim. 

 latit. vix sequans, basi subimmersa, in sicco collabescens, 

 fusca. Trichomala radiantia, cum vaginis stratosis vix coales- 

 centia, primum simplicia, in apicem longe filiformem flcxuosum 

 products, flagelliformia, demum subdichotoina. Articuli breves, 

 contigui nucleolis exiguis foeti, subgranulosi jj (| mm. latilud. 

 sequantes. Cellulae perdurantes ellipiicae, obovataeve, ocbrea 

 amrene lutescentes, exteriores apice infundibuliformi-ampliatae, 

 interiores in comam pertenuissime tfbrillosam abeuntes. 

 Geocyclum oscillarinum Ktz. Tab. phyc. quadantenus in memo- 



riam revocat. 3tn SSologneftfcfcen gefammclt Don SBeccoyr 



Euactis rivularis Ktz., Oscillaria tenuis sordida Ktz., Osnllan 

 autliaria Jiirg., Hypheothrix Dietyolhrix Rab., JNostoc (Hormo 

 siphon) lichenoides Menegb., JNostoc pellucidum K , An aba in; 



