ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 209 



and touching the three, points the gradations of shades indicated by 

 numbers marked on the circle. This scheme is to be applied to the 

 text of L. Rolland's new " Atlas des Champignons." 



Chromogenic Fungi.* — George G. Hedgcock has made a study of 

 those fungi which discolour the wood on which they grow. He divides 

 these into three groups : the wood-bluing fungi represented by Cerato- 

 stomella ; wood-browning fungi, such as Graphium, Hormodendron, etc. ; 

 and wood-reddening fungi, represented by Penicillium and Fnsarivm. 

 In the case of the first two groups, the blue colour of the wood, as well 

 as the brown, is caused by the hyphte of the fungus. FenicilUum 

 secretes a soluble red or yellow pigment, which is absorbed by the wood. 

 Fusarium discolours the wood by its hyphte and by the secretion of a 

 pigment. 



Function of Mycorhiza.t — In an account of the growth of some 

 orchids, M. W. Beijerinck includes a description of the mycorhizge found 

 on their roots. He isolated the mycelium, and grew it on agar plates 

 along with the seed of the orchis, and found that his culture was 

 successful. Without the aid of a fungus the higher plants could not 

 continue to grow. Probably, he thinks, the fungus supplies inorganic 

 as well as albuminoid materials to the higher plant ; he proved that it 

 could not, however, assimilate free nitrogen. 



ANON.^Die Kiefemschutte und ihre Bekampfung. (Pine disease and its cure.) 



[Instructions as to the application of remedies against the fungus Lopho- 

 dennium Pinastri.) 



Oesterr. Furst-Jagdzeit., xxiv. (Wien, 1906) No. 32, pp. 266-7. 

 See also Bot. Centmlbl, civ. (1907) p. 89. 



Brown, A. J. — The Influences regulating the Reproductive Functions of Saccha- 

 romyces cereviseae. 



[The number of yeast-cells present is a factor in the case, also the presence 

 of alcohol and various gases.] 



Journ. CJiem. Soc. London, Ixxxvii. (1905) pp. 1395-1412. 



Butler, E. J. — Fungus Diseases of Sugar-cane in Bengal. 



[An account of various parasites that attack sugar-cane.] 



Mem. Dept. Agric. India (Bot.), i. No. 3 (1906) 53 pp. (11 pis.). 



FiscHE R, Ed. — Tleber einige von Herm Prof. E. Kissling in Sumatra gesammelte 

 Pilze. (Some of the fungi collected by E. Kissling in Sumatra.) 

 [A number of interesting species are described ; one is new 

 to science, Pisolithus Eissliiigi.] 



Mitt. Nat. Ges. Bern, 1906, 15 pp. (1 pi.). 

 See also Ann. My col., iv. (1906) p. 561. 



„ „ Vorweisung eigentiimlichen Pilzbildungen aus dem Simplon- 



tunnel. (An account of peculiar fungus formations from the 

 Simplon tunnel.) 



[Abnormal forms of Agaricini grew in the steam of a hot 



spring.] Tom. cit., 1905 (1906), p. xix. 



See also Bot. Centralhl., civ. (1907) p. 91. 



* Seventeenth Ann. Rep Wiss. Bot. Jard., 1906, pp. 59-114 (10 pis. and 3 figs.). 

 See also Bot. Centralbl., cii. (1906) p. 637. 



t Landbouwkundig Tijdschrift, 1904. See also Bot. Cantralbl., civ. (1907) 

 pp. 89-90. 



April 17th, 190? P 



