ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 201 



WoLTERECK, R. — Mittheilungeii aus der BiologisclieiL Station in Lnnz. (Commu- 

 nications from the biological station at Lunz.) 



[This paper gives many notes on the characteristics of the surroundings of 

 the three lakes of Lunz, with a preliminary report of the fauna and flora 

 of those lakes, and an account of the new Ijiological station of Lunz.] 



Biol. Centralbl., xxvi. (1906) pp. 463-80 (figs.). 



ZiMMERMANjT, C. — Catalogue das Diatomaceas portuguezas. (Catalogue of 

 Portuguese Diatoms.) Broteria, v. 4 (1906). 



Fungi. 



(By A. LoRRAiN Smith, F.L.S.) 



New Species of Saprolegniaceae.* — C. 1). Harz found on the back 

 of a living carp a vigorous growth of a fungus which he diagnosed as 

 Achyla Hoferi, sp. n. The filaments bore oogonia and numerous large 

 oospores, bub no antheridia. The fungus penetrated deep into the body 

 of the cai-p. The author thinks that it probably does this by means of 

 an enzyme which breaks up the tissues. 



Germination of Synchytrium Spores.f — Walther Rytz publishes a 

 preUminary note on this subject, having been successful in his laboratory 

 cultures of the spores of the species ^S'. alplnum and 8. cupulatum, and 

 of S. saxifragcB sp. n. 



Identity of Mucor Mucedo.J— Guy West Wilson has been tracing the 

 history of Mucor Macedo through various authors back to the " Species 

 Plantarum " of Linnfeus published in 1754. The genus had been founded 

 by Micheli in 17:^9 with the species Mucor vulgaris, now known as 

 Rhizojm.s nigricans. The plant now accepted as Mucor Mucedo was 

 originally described by Tode as Hydropliora stercorea, by Link as Mucor 

 stercoreus, by Persoon as Mucor caninus, and finally by Fresenius as 

 Mucor Mucedo. 



Relation between some Ascomycetes and their Substratum.§ — 

 Carl Kratz has confined his study to a series of Pyrenomycetes that are 

 mainly saprophytic on herbaceous stems or leaves. He examines the 

 nature of the mycelium, the method of infection, and the way in which 

 the fungus adapts itself to the structure of the host. He selects first 

 four species of Leptosplue-ria that gi;ow on the lower parts of the dead 

 stems of Urtica. He finds in the stems of Urtica and allied plants a 

 closed ring of bast fibres through which the myceHum cannot penetrate, 

 and he concludes that infection must have taken place before the forma- 

 tion of this ring, and that these fungi which are seated on the wood 

 were primarily parasitic on the young nettles. Bast fibres and stone 

 cells are impenetrable and unserviceable to mycelium ; all the other 

 tissue elements can be pierced and destroyed. Wood-cells are destroyed 

 by means of an enzyme : when that is not forthcoming the mycelium 

 cannot penetrate the wood, but forms a zone of tissue round the stem. 



* Allg. Fisch. Zeit., 1906, pp. 365-8. See also Bot. Centralbl., civ. (1906) p. 16. 



t Centralbl. Bakt., xvi. (1906) pp. 511-12. 



X Bull. Torrey Bot. Club., xxxiii. (1906) pp. 557-60, 



§ Hedwigia, xlvi. (1906) pp. 1-24 (8 figs.). 



