Algae. — Eumycetes. 541 



disk-shaped expansion is formed at the base of the stipes, and from 

 this the hapteres originate. Ethel S. Gepp. 



Lucas, A. H. S., The gases present in the floats (vesicles) 

 of certain marine Algae. (Proc. Linn. Soc. N. S. Wales. 

 XXXVI. p. 626—631. 1912.) 



The author describes his experiments for determining the nature 

 of the gases in the vesicles of algae. Of the three possible sources 

 of these gases, namely, 1) atmospheric air; 2) the gases dissolved in 

 sea-water; 3) the gases produced by metabolism in the plants them- 

 selves he finds by experiment that the real source is the gases 

 dissolved in the surrounding sea-water. He never detected any 

 gases other than nitrogen and oxygen in the vesicles; and by ana- 

 lysis he found the proportion of oxygen to be less than in ordinary 

 air, and much less than in water dissolved air. It appears therefore 

 that the plants use up some, or a good deal, of the oxygen for 

 other purposes than levitation. The algae examined where Phyl- 

 lospora comosa, Hormosira Banksii, Cystophora monilifera. 



Ethel S. Gepp. 



Blatter, E„ A List of Indian Fungi, chiefly ofthe Bom- 

 bay Presidencv. (Journ. Bombay nat. Hist. Soc. XXI. p. 146. 

 1 pl. 1911.) 



Fifty-eight species are recorded, two of which are new to science, 

 namely RobiUarda scutata, Sydow, and Amphisphaeria khandalen- 

 sis, Rehm. E. M. Wakeneid (Kew.) 



Fischer, E., Neues über den Eichenmehltau. (Schweizer. 

 Zeitschr. Forstwesen. LXIII. 3. p. 94/95. 1912. 



Der Eichenmehltau tritt seit 1907 in Europa epidemisch auf. 

 Die früher vermutete Ansicht, es handle sich um Microsphaera 

 quercina, hat sich inzwischen bestätigt, indem G. Cernand and E. 

 Foex auf Quercus sessiliflora die gesuchten Perithecien gefunden 

 haben. Diese Fruchtbildung- erscheint dem blossen Auge als 

 schwarze, dem weissen Pilzüberzug des Blattes aufsitzende Punkte. 



E. Baumann. 



Hardy, A. D., Association of Alga and Fungus in Salmon 

 disease. (Proc. roy. Soc. Victoria. XXII. p. 27—32. 1910.) 



The writer shows that the alga Myxonerna tenae which is known 

 to occur on the fry of various fishes appears to depend on previous 

 infection by a fungus, probably Saprolegnia sp. In Melbourne 

 the disease is specially prevalent on rainbow trout. 



A. D. Cotton. 



Lancaster, T. L., Preliminary Note on the Fungi of the 

 NewZealand Epiphytic Orchids. (Trans. New Zealand. Inst. 

 XLIIL p. 186. 1910.) 



The fungal hyphae of the roots of epiphytic orchids probably 

 enter the velamen at any point. In the dead velamen cells they 

 meet with no resistance, but in the living cortical cells they are 

 attacked and absorbed by the protoplasm. All stages of degenera- 



