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النشر الإلكتروني

v. b. limosus. Dans les fuites d'eau, sur les rochers où l'eau pluviale s'écoule.

v. c. arboreus. Sur les troncs et les grosses branches des vieux arbres.

Ces deux variétés ont les filaments réunis en faisceaux, mais je n'y ai pas vu de gaîne; elles semblent faire une transition des Oscillatoria aux Microcoleus.

Seytonema (Bory.)

S. Myochrous. (Ag. disp. 38.) Dans les petits cours d'eau.

TRIBU XIV. FRagillariées.

Fragillaria (Lyngb.)

F. Pectinalis. (Lyngb. t. 63.) Sur les plantes aquatiques.

Diatoma (DC.)

D. Tenue. (Ag. syst. 4.) Sur les plantes aquatiques.

Gomphonema (Ag.)

G. Paradoxa. (Ag. syst. 11.) Parasite, sur les algues marines et quelquefois sur celles d'eau douce.

TRIBU XV. NOSTOCHINÉES.

Palmella (Duby.)

P. Cruenta. (Ag. syst. 15.) Au pied des murs humides.

Echinella (Duby.)

E. Fasciculata. (Lyngb. p. 210. t. 70.) Parasite, sur les algues marines.

Frustulia (4g)

F. Olivacea. (Duby Bot. gall. 991.) Dans les petits cours d'eau.

F. Acuta. (Ag. syst. 2.) Dans les fontaines.

Nostoc (Vauch.)

N. Commune. (Vauch. conf. t. 16. f. 1.) Sur les pelouses et les lieux secs après la pluie.

N. Coriaceum. (Vauch. conf. t. 16. f. 4.) Montredon.

N. Verrucosum. (Vauch. conf. t. 16. f. 5.) Dans les cours d'eau douce.

N. Sphæricum. (Vauch, conf. t. 16. f. 2.) Sur les rochers humides.

ADDITIONS ET CORRECTIONS.

Page 14. Note. M. Billet, pendant l'impression de ce Catalogue, profitant d'une situation atmosphérique favorable, a pu mesurer de nouveau les stations du groupe de Carpiagne, sur lesquelles il m'avait manifesté des doutes; voici ses nouvelles mesures, dont les résultats présentent toutes les garanties d'exactitude:

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Le sommet du col qui sépare Saint-Cyr de

Carpiagne..

Page 57. Ligne 5. Dans les buissons, lisez: Dans les ruisseaux. Page 80. Note. Marseille avait eu autrefois un jardin Botanique au vieux Lazaret; pendant longtemps le Zygophyllum fabago s'était propagé dans les environs de cet enclos; Darluc, Histoire naturelle de Provence, le mentionne dans le petit nombre de plantes qu'il cite dans les environs de Marseille; mais aujourd'hui on ne l'y rencontre plus.

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