54 SUMMARY OF CURRENT RESEARCHES RELATING TO 



gathered in October L913 consisted of pale normal plants mixed with 

 dark-coloured plants which were characterized by bearing large [lumbers 

 of peculiarly contorted and considerably hypertrophied trichogynes. No 

 brace of fungal or animal parasites could be found to accouni lor tins 

 hypertrophy. But spermatid were often observed attached to them ; and 

 carpogonia were frequently developing. In the structure of the axis 

 and form of the thallus considerable variation was noted. These details 

 are discussed and dimensions are given. It is probable thai a Beries 

 of growth forms of Batrachospermum moniliforme composed the material 

 examined; and that in certain condition, tins species is an extremely 

 variable one, producing forms which are probably not definite enough 

 to merit the name of species or even of true varieties. No explanation 

 of the hypertrophied trichogynes is at present forthcoming. 



Scinaia.* — W. A. Setchell publishes the results of his Btudies on the 

 Scinaia assemblage. After an account of the history of the genus, he 

 describes the materials, the technique, and the morphology. The 

 author recognizes three genera in the assemblage, Scinaia, Gloiophlcea, 

 and a new genus Pseudoscinaia. Each genus and species is described 

 fully, with the addition of valuable critical notes. A synopsis and a 

 key to both genera and species is given. A chapter on geographical 

 distribution concludes the paper. Scinaia seems to be essentially a 

 northern hemisphere type, since nine of its eleven species are confined 

 to a position north of the equator, and these represent all the various 

 types of structure within the genus. Both Gloiophlcea and Pseudo scinaia 

 have an equal number of species in each hemisphere. Valuable struc- 

 tural drawings illustrate the work. 



Marine Flora of Tatihou and of St.Vaast-la-Hougue.-j-— P. Harlot 

 publishes an interesting note on some of the marine alga? of the island 

 of Tatihou and of St. Yaastda-Hougue. The flora has been well worked 

 by Thuret, Bornet, and others. In the present note the author records 

 several novelties in the district, Cordylecladia erecta, Phyllophora Trailii, 

 Erythrotrichia Welwitschii, Ralfsia deusta. On the other hand, several 

 other species, previously recorded, have disappeared — Codium Bursa, 

 Enteromorpha aureola. Striaria attenuata. Other species, again, have 

 disappeared from their previous habitats, to reappear at-others. Two 

 species are endemic, Stereococcus Malardi Wille, and Polysiphonia 

 rhunensis Thuret. The author notes the fact that Fwns ceranoides 

 grows at the mouth of the Saire, and is always hermaphrodite. He 

 suggests that an observer might do well to study the development of 

 certain species, with their appearance and disappearance. Padina 

 Pavonia and Chorda Filum, growing in well-marked spots, would lend 

 themselves well to such study; and the building up of the simple or 

 branched filaments of diatoms in brackish water, classified by the older 

 diatomists as Schizonema, deserves attention. 



* Univ. California Publications (Bot.) vi. (1914) pp. 79-152 (7 pis.). 

 + Comptes Rendus, clix. (1914) pp. 689-92. 



