234 



MAURICE GOMOi^T. 



tro ad daplo breviores. 3,4 [j. ad 6,7 ut. longi (apicalibiis Ion- 

 gioribus) , protoplasmale tenui-granuloso farcii ; dissepi- 

 menta vix granulata; cellula apicalis acutissima; calyptra 

 nulla (v. s.). 



Hab., ad Hydruros parasilica (sec. auctorem), thermas 

 Albuîeas prope Tibur Italiee (Fiorini-Mazzanli 1). 



Sectio VJ. — Terebriformes. 



35. O. Boryana Bory 



Dict. class. d'fiist. nat., XII, p. 4G5, 1827; e specim. authent. in herb. ThuretI 

 OsciLLATORiA NiGRA, [3 BoRYANA Agardh, Systema Algarum, p. 64, 1824. 



Planche VII, fig. et ^23. 



Slraium atro-chalybeum. Trichomata per totam longitii- 

 dinem vel tantummodo extremitatem versus laxe et regu- 

 lariter spiralia, noiinuUis redis apice uncinatis intermixtis, 

 flexilia, ad genicula constricta, 6 [a ad 8 [j!. crassa, apice 

 plus minusve acuta haud capitata; articuli quadrali, aut 

 diametro ad duplo breviores, 4 ad 6 t^, longi, granulis pro- 

 ioplasmalicis paucis conspersi ; dissepimenta passim tenui- 

 granulata; cellula apicalis superne rotundata vel plus 

 minusve acute conica; calyptra nulla (v. s.). 



Hab. stagna Belgiae ad Saint-Josse-Ten-Noode prope 

 Bruxelles (Bory!) et aquas thermales ad Borcette prope 

 Aix-la-Chapelle (Bory !). 



36. O. terebrîrormîs Agardh 



Aufzuhlung, etc., in Flora, X, p. 634, 1827; e specim. authent. ex herb. Agardh! 

 — Kûtzing, PhycoLogia gêner., p. 185; Phycologia german., p. 158; Species Algar., 

 p. 239; Tabulée phycolog., I, p. 28, tab. 39, fig. VII; e specim. authent. in herb. 

 Thuret! — Rabenborst, F/o?'« eur. Algar., II, p. 98 (variet. exclus.). 



Planche VII, fig. 24. 



Stratum atro-chalybeum. Trichomata flexilia, inferne 

 recta, superne laxe spiralia et terebriformia, rarius tantum- 

 modo uncinata, ad genicula haud constricta, 4 ad 6,5 (x 



