Eumycetes. 47 



Arthur, J. C, North American rose Rusts. (Torreya. IX. 

 p. 21-28. 1909.) 



This paper contains a brief sketch of some of the more in- 

 leresting and important characters of Phragmidium and Caeoma, 

 a key to six species of Phragmidium, with Sketches to show the 

 teliospores, the urediniospores, and the aeciospores of this genus, 

 and an outline map exhibiting the known distribution offive species 

 of Phragmidium that occur on native roses. R. J. Pool. 



Bethel, E., Notes on some species of Gymnosporangium in 

 Colorado. (Mycologia. III. p. 156—160. 1911.) 



This paper is concerned mostly with the description of Gym- 

 nosporajigiutn Kernianum sp. nov. The species is found on Juniperus 

 utahensis. The paper is illustrated by a figure showing the teliospo- 

 res of a number of species of Gymnosporangium and plate with G. 

 Kernianum and G. Nelsoni. A note is also given on Aecidium gra- 

 cilens which infers that this stage may be related to G. speciosum. 



R. J. Pool. 



Butler, E. J., On Allomyces, a new aquatic fungus. (Ann, Bot. 

 XXV. p. 1023—1034 with 15 figs. Oct. 1911.) 



The new genus, a Phycomycete of the family Leptomitaceae, was 

 found in river water in two districts in India. It is regarded as an 

 aberrant member of the family, in as much as it has a completely 

 segmented thallus. The fungus gives a reddish yellow colour with 

 chlor-zinc iodine, and by this means is sharply distinguished from 

 Saprolegniaceae. Its nearest ally appears to be Blastocladia, and 

 with this genus and Gonopodya it constitutes a group of forms with 

 non-cellulose walls and predominately 1 ciliate zoospores. This group 

 is believed to show affinity to Monoblepharis, the peculiar resting 

 spores of Allomyces and Blastocladia being held to be partheno- 

 genetically developed oospores, derived from the Monoblepharis type. 

 A Single species of the new genus, A. arbuscula, is described, which 

 was found on dead flies. The paper concludes with a discussion of 

 the affinities of the Leptomitaceae. A. D. Cotton. 



Demelius, P., Beitrag zur Kenntnis der Cystiden. I — III. 

 (Verh. k. k. zool.-bot. Ges. Wien. LXI. 7/8. p. 278—287, 322-332. 

 9/10. p. 378-394. 1911.) 



Die Hauptergebnisse liegen in folgendem: 



1. Die biologische Bedeutung der Cystiden (im gebräuchl. Sinne) 

 bei den Agaricineen scheint auch darin zu liegen, dass sie in manchen 

 Fällen ein Abwehrmittel gegen winzige Schädlinge aus dem Tier- 

 reiche ist. Die Cystiden von Panus stipticus oder Mycena cohaerens 

 erschweren sicher ein Eindringen. 



2) Die Cystiden sind, was ihr Vorkommen anbelangt und auch 

 bezüglich ihrer Form, bei manchen Arten variabel z.B. bei Collybia 

 radicata Reih, wo neben den normalen keulenförmigen mit Exkre- 

 tionen versehenen Cystiden auch spindelförmige mit oder ohne Ex- 

 kretionen vorkommen und darauf legt Verf. viel Gewicht. Er unter 

 suchte viele Arten, bei jeder derselben gibt er die Masse des 



