ZOOLOGY AND BOTANY, MICROSCOPY", ETC. 475 



was due to an optical illusion, produced by a convergence of luminous 

 rays. No fatty matter was found. The non-amylaceous granulations 

 appear to be metachromatic. This alga is allied morphologically to 

 the Florideae, and must no longer be classed with Cyanophycese and 

 Protococeacege. 



Symbiosis between Planorbis and Batrachospermum.* — H. litis 

 describes a symbiosis, which he found existing in a pool near Brunn, 

 between Batrachospermum vagum Ag. f. epiplanorbis and a Planorbis, 

 on the upper side of whose shell it was growing. He regards it as a 

 case of symbiosis, not of epiphytism. In summer the alga grows only 

 on Planorbis, in spring and autumn it is to be found elsewhere. This 

 Batrachospermum lives in symbiosis not only with Planorbis but also 

 with Nostoc sphsericwn Vauch., which occurs in round or oval colonies 

 between the branch lets. The symbiosis with Planorbis is continued to 

 the second generation, the Batrachospermum growing on the spawn of 

 the Planorbis. The advantages it gains are that it is carried into new 

 surroundings rich in food, and is protected from the influence of high 

 temperatures. The author suspects a further instance of symbiosis 

 between Vhsetophora cornu-Bamse and Bimnsea palustris. 



Parasitic Floridese.f — W. A. Setchell publishes the first part of a 

 work on Parasitic Florideaa, wherein he treats of JanczewsJcia. The 

 history of this genus is given, and a short account of the material used 

 by the author. In all cases recorded the alga? grows on hosts of the 

 same family as itself, Rhodomelaceae. They are species of Baurencia, 

 Cho/idria, and Gladhymenia. A section is devoted to the morphology 

 of the genus, and then follows the systematic treatment. Six species 

 are described, of which four are new. Three species " imperfecte 

 cognitaa " are also given. The name Baurencia subopposita, one of the 

 hosts, supersedes the old Chondriopsis subopposita of J. G. Agardh. 

 Relationships and distribution are dealt with. Thus far the species 

 have only been found in temperate seas ; but since the host-genera 

 occur also in both the wanner temperate and the tropical waters it is 

 not unreasonable to expect that Janczewskia may also be found there. 



New Japanese Algae.:]: — K. Yendo describes some new species of 

 marine algae from Japan, and rectifies mistakes in identification of other 

 species. One of the new species is a remarkable parasite, which he 

 describes in detail, Benzaitenia yenoshimensis, a new genus. 



Algae of Atlantic Islands.§— L. Gain publishes a . list of algae 

 collected by himself at Madeira and the Azores, followed by a list of 

 species hitherto recorded at the Grande Salvage and the Azores. Fifty 

 species are recorded from the Grande Salvage, the flora of which is very 

 similar to that of the Canaries. The Madeira list numbers seventeen 



* Biol. Centralbl., xxxiii. (1913; pp. 685-700. 



+ Univ. California Publications, Bot. vi. (1914) pp. 1-34 (6 pis.). 



\ Nyt. Mag. Natur., li. (1913) pp. 275-89 (2 pis.). 



§ Bull. Inst. Oceanogr. (1913 23 pp. (1 fig.). 



