ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 343 



In a further note he repeats and emphasises his observations, that 

 the perpetuation of mildew of the vine is due to mycelium in a resting 

 condition rather than to spores. He gives an account of the observa- 

 tions that have led him to this conclusion. 



Parasite of Stigmarian Rootlets.* — F. E. Weiss found in the 

 section of a rootlet from the Halifax hard bed, a condition of tissue that 

 he thinks can only be explained by the supposition that the rootlet had 

 been invaded by a parasitic fungus. In the middle cortex there occurs 

 a mass of more or less regular secondary cells, and towards the outside 

 there is a patch of compressed disorganised tissue which cannot be 

 identified, but which may be fungal. A large cylindrical cell arises 

 from the outer secondary tissue and passes outwards, and in this cell 

 there is a fairly large spore-like body with indications of other similar 

 bodies. Weiss concludes that these are the spores of a Urophlyctis, 

 and should his surmise prove correct he would suggest the name of 

 Urophhjctites Stigmarke. 



Uredinopsis. t — P- Magnus contributes a paper on this genus 

 originally founded by himself. He gives a history of the different 

 species, all of which grow on ferns. There are two forms of Uredo- 

 spore enclosed by a peridium, the teleutospores are two- to four-celled, 

 and the intercellular mycelium does not form haustoria. Four species 

 of this genus come from America ; only two have been found in 

 Europe. 



Notes on Uredinese. % — P. Dietel describes two members of Melam- 

 psoracea?. The first, Pucciiuosteh mandschurica, grows on Astilbe 

 chinensis in Manchuria. It has two forms of teleutospore. The second 

 of these develops in autumn in spore-chains. He found a second 

 fungus on the same host, which he makes the type of a new r genus 

 Klastospoi'a. The teleutospores are one-celled and are also produced 

 in chains. In both these genera the teleutospores fall to the ground 

 leaving an empty, hollow 7 , crater-like bed. 



Phthiriosis of the Vine.§ — This fungoid disease due to a symbiotic 

 association between the cochineal insect and the mycelium of a fungus 

 had hitherto been found underground on the roots of the vine, where 

 the cochineal had burrowed for the sake of moisture. A very wet 

 season in Syria has induced an aerial growth of the mycelial masses, 

 which enveloped the branches of the vine ; and L. Mangin and P. Yiala 

 record their observations on the new development of Bornetina corium. 

 The change in form and structure resembles the effects already obtained 

 by them in artificial cultures. 



Eriksson's Mycoplasma Hypothesis.! — G. B. Traverso gives an 

 account of Eriksson's theories as to the propagation of rust in cereals 

 and the objections that have been raised against it. He thinks that 

 the controversy remains undecided, and that more research and more 



* New Phjtolog., iii. (1004) pp. 63-8. 



+ Hedwigia, xliii. (1904) pp. 119-25 (2 pis.). 



% Aiie. Mycol., ii. (1904; pp. 20-6. 



§ CompttB Reudus, cxxxviii. (1904) pp. 529-31. 



|| Bull. Slc. Eot. Ital., 1903, pp. 311-18. 



