February, 1920] MORPHOLOGY, ETC., FUNGI, ETC. 51 



setae between the basidia." The form <>f the fruit body varies from stipitate to resupinate. 

 Emphasis is placed upon the fact that a single species may vary greatly in habit and form 

 depending upon its position <>n the substratum. A species may be resupinate on the under 

 side of a log and reflexed when developed up its side. Attention is called to the fact that the 

 species of this genus possess a chemical substance in the tissue of the fruit body which causes 

 an immediate darkening of sections when potassium hydrate is brought in contact with them. 

 The genus is subdivided into two groups of species. In one group the setigerous tissue is 

 seated directly on the substratum. In the other a hyphal layer destitute of setae lies between 

 the substratum and the setigerous layer. — H. M. Filzpalrick. 



350. Chenantais, J. E. Trois Descomycetes. [Three Discomycetes.] Bull. Trimest. 

 Soc. Mycolog. France 34:34-10. PI. 8. 1918. — The author describes three Discomycetes, 

 Ascophanus Holmskjoldii, Hyahnia Ulicis, and Pithyella harnata. — Fred C. Werkenthin. 



351. Chenantais, J. E. Etude sur les Pyrenomycetes. [A study of the Pyrenomycetes.] 

 Bull. Trimest. Soc. Mycolog. France 34:47-73. Fig. 1-5. 1918.— The author comes to the 

 conclusion that the exterior distinction upon which the genera Caelosphaeria and Nitschkia 

 are based are of no value. Nitschkia tristis and Nitschkia collapsa constitute only two forms 

 of the same genus. — Fred C. Werkenthin. 



352. Conn, H. J., and J. W. Bright. Ammonification of manure in soil. Jour. Agric. 

 Res. 16: 313-350. 1919.— See Bot. Absts. 3, Entry 850. 



353. Davis, W. H. The aecial stage of alsike clover rust. Proc. Iowa Acad. Sci. 24: 

 461-477. 1917 (1918). — A rust of the genus Uromyces is prevalent in this latitude on the 

 common clovers, such as Tiifolium repens, T. pratense, and T. hybridum (alsike). Evidence 

 is given to show that pyenia and aecia are developed on the leaves of alsike clover. Com- 

 parison of the aecia and pyenia of the rust on T. hybridium, with that on T. repens and T. 

 pratense, shows that they are not the same. — Cross inoculations with any of the spore forms 

 of alsike clover rust show that this rust will not cause infection on red clover, white clover, 

 mammoth clover, crimson clover, alfalfa, or white melilot. The rust of alsike clover is shown 

 to be long cycled, autoecious, having all the spore forms. A morphological difference is evi- 

 denced by measurements. The causal organism is Nigredo hybridi Davis; Otherwise, 

 Uromyces hybridi Davis. — I. E. Melhus. 



354. Dufour, Le6n. Note sur le mode de vegetation du Plicaria leiocarpa Currey. 

 [Method of forming fruiting bodies by Plicaria leiocarpa Currey.] Bull. Trimest. Soc. Mycolog. 

 France 34: 31-33. 1918. — The author gives a detailed description of the formation of fruiting 

 bodies of Plicaria leiocarpa. — Fred. C. Werkenthin. 



355. Dtjfrenoy, J. Les conditions ecologiques du developpement des champignons para- 

 sites. — Etude de geographie botanique. [Ecological relations of the development of parasitic 

 fungi.] Bull. Trimest. Soc. Mycolog. France 34: 8-26. 1918. 



356. Eriksson, Jacob. Zur Entwickelungsgeschichte des Spinatschimmels (Peronspora 

 spinaciae (Grew.) Laub.) [Life history of P. spinaciae.] Ark. for Bot. 15 15 : 1-25. PL 4, 

 S fig. 1918. — The fungus is widely distributed geographically. It has been confused with 

 P. effusa on Chenopodiaceae but it is morphologically as well as physiologically different. — 

 Large spots appear on the young leaves of spinach (Spinacia oleracea) which are yellowish to 

 white above and gray-blue beneath from conidiophores. Later the whole leaf is involved. — 

 Most investigators have denied the presence of oospores in P. spinaciae. Accordingly a 

 cytological study of the development cycle of the organism was undertaken. Leaf tissue 

 from a healthy plant was compared with apparently disease-free leaf tissue of a plant showing 

 the disease in its primary stage on certain leaves. No trace of mycelium could be found in 

 either, but certain rather pronounced differences were observed in cell structure. These are 

 illustrated by photomicrographs. Bodies resembling chondriosomes and mitochondria were 



