222 



Species extraeuropaeae. 



Rivularia cerebrina Montagne ( hist. nat. des Can. plant. cell. 

 p. 190.), thallo amplo , gelatinoso , plano - convexo , gyroso-plicato, obs- 

 cure viridi, exsiccat. atro ; trichomatibus crassis, appositione dichotomis ; 

 articulis transversim oblongis , sensim decrescentibus. ■ — Ad rupes, in 

 littore Canariae. 



R. monticulosa Montagne (1. c. Euactis monticulosa Ktz. Spec), 

 thallo amplo orbiculari plano, centro tuberculoso-colliculoso, ad ambitum 

 incrassatum subundulato, subtus revoluto, atro-viridi; trichomatibus in 

 orbiculos distinctos aggregatis , fastigiatis , appositione ramosis. — Ad 

 saxa haud madida, in promontorio Punta de Melenera dicto, in Canariis 

 (Despreaux). 



R. Duriaei Montagne (Flor. Alger. sect. Algues p. 184.), gregaria ; 

 thallo adnato depresso , suborbiculari aut confiuente difformi , exsiccat. 

 atro - viridi ; trichomatibus fiagelliformibus simplicibus, e stromate muci- 

 lagineo cellulis granulosis farcto exeuntibus undique irradiantibus ; 

 vagina hyalina, integra, laxa; articulis rotundato - quadratis submonili- 

 formi-seriatis. Ad culmos putridos, in paludosis lacus El-Hout, prope 

 La Calle (Durieu). 



R. mexicana (Physactis mexicana Ktz. Osterprogr. p. 9. N. 23.). 

 Ph. mollis gelatinosa , subglobosa , pallide viridis , primum adnatum, 

 dein libere natans , subirregularis ; trichomatibus laxe intricatis , 7 2s & 

 — l lioo 4 " crassis , fiagelliformibus , apice in pilum hyalinum attenuatis. 

 — In stagnis Americae (Ferd. Miiller). 



Zonotrichia Lindigii Rabenh. Z. thallo hemisphaerico-pisiformis, 

 aerugineo-fuscescens , indurata; trichomatibus inaequalibus : centralibus 

 gracillimis , longissime cuspidatis , indistincte articulatis , periphericis 

 crassioribus fiagelliformibus, basin versus submoniliformibus , sursum in 

 pilum achroum spiraliter contortum productis ; vaginis amplis , centrali- 

 bus in gelatinam matricalem diffiuentibus, periphericis distinctis, longi- 

 tudinaliter plicatis, apice in fibrillas elongatas solutis , plerumque aureo- 

 zonatis ; cellulis perdurantibus globosis hyalinis, trichomatum centralium 

 diametro 3 — 4-plo, peripheric. diam. paulo majoribus. v. s. 



Diam. trich. centr. ' 1000 — Vsoo"' = 0,00009—0,00011", trich. 

 periph. s. v. 7480— Vsso'" — 0,00018—0,00025". 



Hab. in saxis fiuminis „ Bogot;i " in Columbia. 



Genera mihi ignota et non sat clara. 

 XXVI. IHplotriclliil J. Ag. (1842).- Trichomata sim- 

 plicia intus annulata, a globulo hemisphaerico egredicntia bina, e strato 



