194 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Zostericola Batt. A plate is given which shows Dictyota spiralis and the 

 two new species. 



Phycological Studies.* — M. A. Howe continues his studies on 

 marine algas, based on material collected by himself in the West Indies. 

 He describes as new species, Halimeda favulosa, Avrainvillea levis, 

 Gladocephalus scoparius, the type of a new genus between Avrainvillea 

 and Udotea, Sarcomenia filamentosa, and Dudresnaya crassa. Critical 

 notes are given on Caulerpa crassifolia, C. sertularioides, Acetabulum 

 Farlowii, Batophora Oerste.ii, and its variety occidentalis (= Dasycladus 

 occidentalis Harv.), Neomeris Cokeri, Fucus spiralis, and F. Poitei. All 

 these notes contain valuable information as to types, synonymy, and 

 habitat, the author having collected many of the species. His notes on 

 the original types, seen by him in various European herbaria, are 

 specially valuable. 



Floating Marine Algse.f — L. K. Rosenvinge has made a study of 

 the marine algae thrown up on the west coast of Jutland, and he enu- 

 merates them and adds notes on their place of origin and condition. 

 No less than 44 species have been carried over from foreign shores, 

 either by the current which flows from the English Channel along the 

 Dutch and German coasts, or by that which passes from the Atlantic 

 along the North of Scotland, down the Eastern coasts of Great Britain, 

 and across the North Sea. Of these 44 species, 39 were brought over 

 by Ascophyllum and Himanthalia, and 5 were fixed on floating planks. 

 The species which has travelled furthest is a Laminaria, with a hollow 

 stem, which may be L. longicruris, from Greenland or North America ; 

 or it may be L. faeroensis, from the Faeroes and East Iceland. Of the 

 44 species, 27 were found bearing organs of reproduction, and the author 

 is inclined to think that, in many cases at least, the spores are capable of 

 germination. The fact that many of these species are not found living 

 on the coast is probably due to the unsuitable conditions which obtain 

 there. 



Principle of Systematising Corallinae.J — K. Yendo has made fur- 

 ther studies on the group of the Corallinae, and he publishes his views 

 on the validity of certain characters from the point of view of classi- 

 fication. He considers the most reliable character to be that of the 

 reproductive organs ; then the internal, and finally the external structure 

 of the thallus. He deals, first, with " propagating organs," and shows 

 the difficulties of distinguishing the genera satisfactorily. He finds that 

 in plants placed hitherto in Amphiroa, the spores are sometimes of 

 medullary and sometimes of cortical origin, but always constant in one 

 and the same species. " Ramification " forms the next subject, and this 

 is followed by remarks on articuli and genicula. The geniculation is 

 regarded by the author as the steadiest character next to the mode of 

 fertilisation. The whole of this work is to be published at greater 

 length and in more detail in the 'Journal' of the College of Science, 

 Tokyo. 



• Bull. Torrey Bot. Club, xxxii. (1905) pp. 563-586 (7 pis). 

 t Bot. Tidssk., xxvii. (1905) pp. 83-106. French resume. 

 t Bot. Mag. Tokyo, xix. (1905) pp. 115-26. 



