63 



a depose; son etude nous aurait procure probablemeut quel- 

 ques espeees fort interessantes. 



Les ecliantillons du travertin de la Compissade nous ont 

 donne la tlorule suivante: 



Achnanhtes brevipes Ag. 



Achnanthes brevipes var. intermedia Ktz. 



Achnanthes lanceolata Breb. 



Achnanthes lanceolata var. FAEROENSIS Ost. iMouveau 



pour la region. 

 Achnanthes minutissima Ktz. 



Achnanthes minutissima var. oryptocephala Grun. 

 Cymbella ventricosa Ktz. 

 Denticula tennis Ktz. 



Denticula tenuis var. intermedia Grun. 

 Diploneis elliptica, Cleve. 

 Epithemia turgida Ktz. 

 Fragilaria intermedia Grun. 

 Gomphonema 'parvulum, Ktz. 

 ^(icicuhi alpestris Grun. 

 Navicula appendiculata Ag. 

 ^avicula dncta Eli. 

 Navicula cincta var. Heu fieri Grun. 

 NaiVficiila fasciata Lag. 



Navicula fasciata var. inconstantissima Grun. 

 Navicula fasciata var. thermalis Grun. 

 Navicula major Ktz. 

 Navicula peregrina Eh. 

 Naricula peregrina var. meniscus Sc'hinn. 

 Navicula viridis Nitz. 

 .\ itzschia amphibia Grun. 

 Nitzschia bilobata "W. Sm. 

 N itzschia bilobata var. minor Grun. 

 .A itzschia commutata Grun. 

 Nitzschia inconspicua Grun. 

 .\ itzschia linear is W. Sm. 

 Nitzschia vitrea Norm. 

 Nitzschia vitrea var. gallica M. Per. 

 Rhoicosphenia curvata Grun. 

 Rhopalodia gibberula 0. Miiil. 

 Rhopalodia gibberula var. F<w Heurcltii 0. Miill. 



