1gi2] CURRENT LITERATURE 79 
of Abies excelsa in the Erzgebirge —I. URBAN (Bot. Jahrb. 45:432-470. 1911) 
in co-operation with several specialists, under the title ‘“‘ Plantae novae andinae 
imprimis Weberbauerianae V,’’ has published 72 new species of flowering - 
plants from South America.—Woop and Franks (Kew Bull. 274, 275. 1911) 
have published a new genus (Siphonochilus) of the Scitamineae from Natal.— 
H. F. WERNHAM (Journ. Bot. 49: 206-216. 1911) presents a revision of the 
American genus Hamelia, recognizing 27 species, of which one-third are char- 
acterized as new. ‘The genus attains its greatest specific diversity in Mexico.— 
H. Wo.rr (Rep. Nov. Sp. 9:417-422. 1911) under the title “ Umbelliferae 
Novae 1” has published several new species and proposes the following new 
genera from Mexico: Nematosciadium, Schiedeophytum, and Langlassea.— 
. WorontcuIn (Ann. Mycol. 9:217-225. 1911) has characterized a new 
genus ‘as sadothcelen of the Pyrenomycetes. The genus, as at present 
understood, embraces 6 species having a distribution in the United States and 
Europe.—J. M. GREENMAN 
Biology of rusts.—The results of further studies on the biology of rusts 
are reported by FIscHER in two papers. The first one® is a continuation of a 
series of former studies, and includes four additional forms: Uromyces caryo- 
RT. (Schrank) Winter on Saponaria ocymoides L. and Euphorbia Gerardi- 
a Jacq.; Gymnosporangium tremelloides Hartig on Juniperus communis 
i. Sib Aria (L.) Crantz, S. chamaemespilus (L.) Crantz, and the hybrid 
et S. hybrida Koch (S. ieee . Aria) and S. latifolia (Lam.) Pers. 
(S. pri S. torminalis); Ochrospora Sorbi (Oud.) Diet. on Aruncus sylvester 
Kost. and Anemone nemorosa L.; and Puccinia albulensis P. Magn., a micro- 
Puccinia on Veronica bellidioides L. and V. aphylla L. 
_ The discovery that the teleutospore generation belonging to Aecidium 
Euphorbiae Gerardianae occurs on members of the Caryophyllaceae serves 
as an illustration of the proposition formulated by FiscHER that on the hosts 
bearing the aecidial generation of certain heteroecious rusts there occur also 
micro- and lepto-forms whose teleutospores resemble the teleutospores of 
the heteroecious forms in question. The aecidium on Euphorbia Gerardiana 
has generally been regarded as belonging to Uromyces excavatus (DC.) P. 
Magnus on the same host; but the close resemblance between the teleutospores 
of U. excavatus and those of U. caryophyllinus occurring on members of the pi 
family led TRANZSCHEL to predict that the teleutospore form of Aecidium 
Euphorbiae Gerardianae would be found among the species of Uromyces para- 
sitic on the Caryophyllaceae. The cultural work of FiscHer has shown the 
correctness of this prediction. It is probable that this resemblance, which 
has led to the discovery of the connection between aecidia and teleutospores 
in several cases, represents something more than a mere superficial similarity, 
° Fiscuer, Ep., Betrige zur Entwicklungsgeschichte der Uredineen, Centralbl. 
Bakt. II. 28:139-152. 1910. 
