ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 209 



state. Jania ndhserens is found in small tufts on stones, but mostly in 

 large rose-red or whitish balls on Cystoseira. Chsetomorpha serea occurs 

 in March in masses in shallow water, but in June very few pieces 

 remain. 



Algse of the Black Sea.* — C. von Deckenbacli makes some 

 additions to the marine flora of the Black Sea, and confirms ;i previous 

 statement that the Black Sea in respect of its algae is merely a province 

 of the Mediterranean. He gives some notes showing that the horizontal 

 distribution characteristic of the Mediterranean species holds good also 

 for the Black Sea. He records a few species new to the flora. 



Cystoseira.— C. Sauvageauf gives an account of the genus Cystoseira, 

 1. He passes under criticism the Mediterranean species, shows how 

 much they have been misunderstood and confused, and indicates five 

 new species, the diagnoses of which (with a new species from the 

 Canaries) he will give in a future paper. 2. He describes as occurring 

 in certain species some conceptacles that have the character of piliferous 

 crypts, and therefore constitute the sought-for transition between con- 

 ceptacles and piliferous crypts. :-i. He treats of the independent life of 

 the nuclei or oospheres expelled into the oogonium of the Fucaceae, and 

 the possibility of their fecundation. 4. He also discusses those species 

 of Cystoseira which have antherozoids without a red spot ; and treats of 

 the phenomena of fertilization. 



In a second group of papers |: — 1. He describes the more important 

 differences exhibited by several species of Cystoseira in their vegetative 

 habit. 2. He discusses the aerocysts of the species, their presence or 

 absence according to season, their possible relation to distribution of 

 fertile branches, etc. 3. He treats of the iridescence exhibited by 

 Cystoseira, and shows that it is a mistake to suppose that it can be a 

 mode of protection against intensity of light, for in that case it would 

 be absent from deep-growing species. 4. He describes the double 

 fructification of C. Montagnel and C. opuntioides. He believes that 

 Carpodesmia zosteroides, recorded a r-entury ago and not found again, is 

 a leafy fragment of C. opuntioides. 



Fucus.§— J. Richard publishes some observations on Fucus. The 

 species vary in form according to locality and exposure to air. In the 

 Traict. and in the salt marshes of the Croisic, the vesicles of F. vesi- 

 culosus are sometimes completely absent, while the frond of F . platycarpus 

 sometimes bears elongate vesicles. The author thinks it probable that 

 F. vesiculosus hybridizes with F. serratus and F. platycarpus. 



Polymorphism of Fucus. |1 — J. Richard describes the local forms of 

 Fucus observed in three localities to the north of and near the mouth 

 of the Loire. The polymorphism of the species is dependent on the 

 environment. On the main coast F. platyrarpus is typical ; F. vesi- 



* Beih. Bot. Centralbl., xxviii. 2te Abt. (1911) pp. 536-40. 



t C.R. Soc. Biol. Paris, Ixxi. (1911) pp. 467-73. 



X C.R. Soc. Biol. Paris, Ixxi. (1911) pp. 680-6. 



§ Bull. Soc. Sci. Nat. Quest de la France, s6r. 3, i. (1911) pp. 115-18. 



II C.R. Soc. Biol. Paris, Ixxi. (1911) pp. 172-3. 



