704 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Brazil caused by a fungus Tsariopsis griseola. It forms brown polygonal 

 patches on the leaves and also on the pods. The damage is often 

 increased by the presence of Erysiphe communis and Uromyces appendi- 

 culatus. 



£]i,The same writer* has also given his attention to the rust of cereals 

 in S. Paulo, where it is very frequent. The species found there is 

 Puccinia rubigo-vera and not P. graminis. He explains the absence 

 of the latter by the long distance, which the uredospores are unable to 

 traverse, and by the unfavourable conditions for the germination of the 

 teleutospores (absence of low temperatures and want of Berberis) ; 

 P. coronata is common on oats, and does great damage ; P. Sorghi is also 

 found at S. Paulo, but is comparatively harmless. 



Wm. Stuart t has experimented with potatoes to find disease-resisting 

 varieties. Those of an upright habit, with firm, hairy, medium-sized 

 leaves were found to be most resistant. Some hybrids showed high 

 resistance to disease, but with slight formation of tubers, and were 

 valuable only to hybridise with well-known cultivated varieties. 



F. W. Neger J describes the ravages of Dermatea carpinea, a wound- 

 parasite on the beech-trees. It establishes itself on dead branches and 

 passes into the living parts of the tree, which it destroys. The spores 

 are disseminated by damp winds. Neger produced the conidial-form in 

 artificial cultures. 



A leaflet § has been issued with information concerning the Tree- 

 root rot (Armillaria mellea). It attacks almost any kind of tree, 

 travelling along the ground as rhizomorphous strands. Instructions 

 are given for detecting the fungus, and for the best way of eradicating it. 



Banker, H. J. — A Contribution to a revision of the North American Hydnacese. 



[The writer introduces two new genera, Leaia and Grandinoides. 



Bull. Torrey Bot. Club, xii. (1906) pp. 99-194. 

 See also Bot. Centralbl, cii. (1906) pp. 331-2. 



Diet el, P. — Beschreibungen einiger neuer TJredineen. (Description of some new 

 Uredinese.) 



[The species are from India, Japan, America, etc.] 



Ann. My col., iv. (1906) pp. 303-8. 



Fair man, Charles E. — New or Rare Pyrenomycetse from Western New York. 



[Most of the species described are new to science.] 



Proc. Boch. Acad. Set., iv. (1906) 



pp. 215-24 (3 pis.). 



,, „ Pyrenomycetse novae in leguminibus Robinise. (New 



Pyrenomycetes on the pods of Bobinia pseud- 

 acacia.). 



[Fairman describes five new species.] 



Ann. My col, iv. (1906) pp. 326-8 (4 figs.). 



* Ext. de Annuario Esc. Polyt. (S. Paulo, 1905) 20 pp., 10 figs. See also 

 Bot. Centralbl., cii. (1906) p. 226. 



t Vermont, Agric. Exper. Stat., Bull, exxii. (1906) pp. 107-36. See also Bot. 

 Centralbl., cii. (1906) p. 199. 



1 Tharandter Forstl. Jahrb., lvi. (1906) pp. 49-62. See also Bot. Centralbl., 

 cii. (1906) pp. 338-9. 



§ Board of Agric. and Fish., Leaflet No. 174 (1906) 3 pp. (1 fig.). 



