Palaeontologie. — Eumycetes. 619 



Farr, C. H.., Notes on a fossil tree-fern oflowa. (Proc. Iowa 

 Ac. Science. XXI. p. 59—65. 5 Fig. 1914.) 



In this paper a specimen of Psaronius, showing structure, is 

 described. The specimen has not been named, but is compared with 

 P. borealis Macbr. The researches were made from polished surfaces 

 only and include observations on the arrangement of the leaf scars 

 and the general system of vascular supply. Each leaf base has a 

 Single leaf trace. As it enters the leaf base it is broad, and sUghtly 

 convex outward. As it passes in its outward course between two of 

 the horseshoe-shaped peripheral Strands it connects with them 

 along either edge. It will thus be seen that the peripheral Strand 

 in its upward course unites with a leaf trace first on one side and 

 then on the other, but at no one level do peripheral Strands and 

 leaf traces constitute a complete ring. 



All leaf traces originate from the central Strand of the stem 

 and after more or less, local, anastomosis proceed individually to 

 their respective leaf bases. In their course they fuse laterally with 

 the leaf traces of the whorl immediately above and that immedia- 

 tely below. In this way two concentric vascular rings are seen to be 

 formed enveloping the central Strand. Each of these rings is, however, 

 slightly perforate, due to the anastomosis of the individual leaf 

 traces into three Strands at different levels. 



The description of P. borealis Macbr. is added to this paper 

 for comparison. Jongmans. 



Anderson, P. J., Some observations on Sycaraore blight 

 and accompanying fungi. (Proc. Iowa Ac. Scienc. XXI. p. 

 109-114. PI. 7, 8. 1914.) 



In the spring of the year 1913 the Sycamore blight {Gnonionia 

 veneta [Sacc. et Speg.] Kleb.) was very prevalent and destructive 

 in the vicinit)'' of Am es. The writer made several observations on 

 the development of this fungus. In making plate cultures for the 

 purpose of isolating the fungus many other fungi occurred. On some 

 of them, Coniothyrium mixtu^n Fuckel, Cytospora platani Fuckel and 

 Massaria platani Ces., some observations on occurrence and deve- 

 lopment are communicated by the author. The plates show different 

 stages of these four species. Jongmans. 



Arthur, J. C. and F. D. Fromme. New species of grass 

 rusts. (Torreya. XV. p. 260—265. Dec. 1915.) 



Uroinyces Jacksonii, U. Archerianus, Puccinia dolosa, P. Lepto- 

 chloae, P. unica Holway, P. Chaseana, and Uredo quinqiieporula. 



Trelease. 



Duggar, B. M., Rhizoctonia Crocorum (Pers.) D. C. and R. Solant 

 Kühn {Corticium vagum B. & C.) with notes on other spe- 

 cies. (Ann. Mo. Bot. Card. II. p. 403 — 458. f. 1—9. Sept. 1915.) 



Duggar, after a careful study of material from various localities 

 in Europe and two American collections, concludes that the vio- 

 let root feit fungus should be referred to as Rhi~octonia Crocorum 

 (Pers.) D.C. He found that this name, unfortunatel}^ has priority 

 over R. medicagims D.C. and that while R. violacea would be a 

 good descriptive name, the use of this term would not conform to 

 the rules. 



