ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 697 



Municipal Museum at Venice. No fructification has been found, and it 

 is therefore impossible to place the species with certainty in its right 

 section of Griffithsia, though it probably belongs to Acrocladia. The 

 original specimens do not exceed 3 cm. in length, and are irregularly 

 dichotomous. Some of the branches have a tendency to form hooks 

 such as are seen in Hypncea and Campykephora. A careful comparison 

 of 67. acuta with G.furcellata J. Ag. and with 67. Duricei Mont, brings 

 the author to the conclusion that they are all the same species, G. acuta 

 forming the connecting-link between the other two. They must now 

 be known under the name of 67. furcellata J. Ag. as being the oldest 

 name. The nearest ally of this conjoint species is 67. setacea Ag. 



Breemen, P. J., van — Bemerkungen iiber einige Planktonformen. (Remarks on 

 certain plankton fornis.) Verh. Ryksinst. Onderzoek. d. Zee, 



i. (1906) 8 pp., plate. 



Mazza, A. — Saggio di Algologia Oceanica. (Essay on oceanic algology.) 



[A continuation of this work, including the genera Phyllophora, Steno- 

 gramma, Gymnogongrus, Ahnfeltia, Actinococcus, Colacolepis, Sterro- 

 colax, MycJiodea, and Dicranema.~] 



Ntcov. Notar., xvii. (1906) pp. 129-50. 



N am ik a w a, S. — Fresh- water Algae as an Article of Human Food. 



Bull. Coll. Agr. Tokyo, vii. (1906) p. 123. 



Ridley, H. N. — An Expedition to Christmas Island. 



[This paper includes a list of 22 marine alga?, identified by A. and E. S. 

 Gepp, the notes upon which have been published in the " Journal of 

 Botany." No algae had been recorded previously from the island.] 



Joum. Straits Branch B. Asiatic Soc, 1905, pp. 255-7. 



Fungi. 



(By A. Lorrain Smith, P.L.S.) 



Fung-us of Economic Importance.* — R. and E. Smith describe a 

 new disease that attacks stored lemons, causing very great loss. It is a 

 brown rot with a peculiar odour, and the writers have succeeded in 

 isolating and cultivating the fungus that is the cause of the mischief. 

 On the lemons it appears as a sterile mycelium, and in many of the 

 culture media nothing else grew ; but on soil, where a diseased lemon 

 had lain, or on wet filter paper similarly affected, the spore stage 

 developed abundantly. This was very much like Pythium : a fine 

 septate branching mycelium with terminal sporangia containing swarm- 

 spores. No indication of sexual reproduction was observed. The name 

 Pythiacystis citrophthora g. et sp. n., has been given to the fungus by 

 the authors, who consider it to be intermediate between Saprolegniacea? 

 and Peronosporese. 



Cytology of the Entomophthoraceae.f — Lincoln Ware Riddle has 

 studied material of several species of Entomophthora and of Empusa 

 Grylli, and he considers that the cytological evidence he has gained 

 enables him to trace the descent of this family from a Mucor ancestor. 



* Bot. Gazette, xlii. (1906) pp. 215-21. 



t Proc. Amer. Acad. Sci., xlii. (1906) pp. 178-97 (3 pis.). 



