THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[THIRD SERIES.] 



" per litora spargite museum. 



Naiades, et circdm vitreos coiisidite foiites : 

 PoUice virgineo teneros h"ic carpite flores : 

 Floribus et pictum, divs, replete ranistrum. 

 At vos, o NymphcB Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite rauscosis e rupibus, et mihi conchas 

 Ferte, Deas pelagi, et piiigui conchylia succo." 



N.Parthenii Gianneltasii Kol. I. 



No. 7. JULY 1858. 



I. — Observations on the Reproduction of certain Nostochineae. 

 By M. G. Thuret*. 



[With a Plate.] 



1 HE NostochinecE are among those tribes of Algae of whose 

 reproduction we know least. About thirteen years ago I de- 

 scribed the curious phaenomena accompanying the reproduction 

 of an aquatic Xostoc-\. Since then, no one appears to have taken 

 up this subject ; and M. Fischer :j:, in his memoir on this family, 

 remarks that my observations have remained isolated up to this 

 time. 



But the mode of reproduction which I made known is cer- 

 tainly not peculiar to one species, I cannot doubt that it will 

 be found in all, when it is sought for with a little attention and 

 perseverance. Already the correctness of this assertion has been 



* Translated from Mem. de la Societe des So. Nat. de Clierbourg, 

 Aug. 1857.— A. H. 



t Ann. des So. Nat. 3 ser. ii. p. 319 (1844). The plant forming the object 

 of that paper was not the true Nostoc verrucosum, but a neighbouring 

 species which M. Mougeot had published under this name (Stirj)cs Crypt. 

 \ og. Rhen. fasc. viii. no. 19'^), and which now bears that of Nostoc Mou- 

 geotii, Breb. (Menegh. Monogr. Nostochin. ItaUc. p. 113; Kiitz. Sp. Alg. 

 p. 3f)0.) 



X Beitrage z. Kenntniss der Nostochacea;, Berne, 1853, p. 13. 

 Ann. ^- ^fa(/. X. Hist. Ser. 3. Vol. ii. 1 



