ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 69£ 



North American Species of Peridermium.* — J. C. Arthur and 

 P. D. Kern describe 27 species of Peridermium. As understood by 

 them, the genus includes all JScidia possessing peridia, inhabiting the 

 Pinaceae and Gnebacese. Only three of the species have been definitely 

 connected with other growth-forms, but from the structure of the JEcidia 

 they are able to determine the genus to which they will probably be 

 found to belong. There are seven of these genera : Coleosporium, 

 ( 'ronartium, Pucciniastrum, Calyptospora, Melampsorella, Mehtmpsori- 

 dium, and Ghrysomyxa. Several new species are given by the authors, 

 and keys are drawn up of the hosts as well as of the parasites. 



Hyphomycetes.t — Lindau began, in fascicle 98, the description of 

 the large parasitic genus Ramularia, which is continued through the 

 following fascicle and on to p. 532 of part 100. It is a leaf disease 

 causing spots which are disfiguring even when not greatly harmful. 

 Several new species are described. The Hyalohelicosporge and the 

 Hyalostaurosporre conclude the Mucedineaa. The first section of the 

 Dematiaceas with simple brown spores is begun. As in previous 

 numbers, the genera and some of the species are illustrated in the text. 



In part 101 % he continues the description of the Torulse. The 

 principal genera dealt with are Torula, Hormiscium, and Gyroceras. 

 Some new species are described by the author. The Echinobotryeae 

 and Pericouiese are also described, and the Arthriniae are begun. Keys 

 to the genera head the different chapters. The illustrations, as usual, 

 are abundant and clear. 



Fungus Parasitic on ElodeaJ — Werner Kegel describes an un- 

 usual form of Hyphomycete, which he names Varicosporium Elodece, 

 and which he found constantly infesting plants of Elodea. The conidia 

 are elongate septate, and are borne in acropetal succession but at right 

 angles to each other, so that a confused branching system of conidia is 

 formed. He found also pycnidia, but could not connect the two fungi 

 together. 



Australian Rusts. || — D. McAlpine contributes a further list of hosts 

 for the new Uredineous genus Uromycladium. The genus is confined to 

 acacias, and the rusts grow usually on the phyllodes. The list also 

 includes the species of Uromyces within the same genus of host-plants. 

 McAlpine describes a new JEcidium, the first to be detected on any 

 acacia in Australia. It grows on the shoots and fruits of Acacia far ne- 

 siana, and is recorded from Queensland and West Australia. 



Infection Experiments with Ustilago Carbo.f — Nazareno StrampeUi 

 has followed up Hecke's account of the propagation of the smut of 

 cereals by a series of inoculation experiments carried out with every 

 precaution as to sterilisation and protection during growth. Those 

 plants that were inoculated with smut spores at the time of flowering, 

 became completely carbonised ; others, that were grown as control 



* Bull. Torrey Bot. Club, xxxiii. (1906) pp. 403-38. 



t Rabenhorst's Kryptogamen-Flora, i. Abt. 8, Lief. 99 (Leipzig, 1906) pp. 

 433-512; Lief. 100, pp. 513-76. 



t Op. cit., Lief. 101 (Leipzig, 1906) pp. 577-640. 



§ Ber. Deutsch. Bot. Gesell., xxiv (1906) pp. 213-16. 



|| Ann. Mycol., iv. (1906) pp. 322-6. 



^f Atti Reale Acad. Lincei, ccciii. (1906) pp. 211-13. 



