568 SUMMARY OF CURRENT RESEARCHES RELATING TO 



D. Macalpine * gives a detailed account of tlie fungi parasitic on the 

 various species of Citrus grown in Australia. He enumerates no less 

 than 82 species, of which 51 are described as new. 



D. Griffiths f describes a new ergot, Claviceps cinereum sp. n., 

 parasitic on two grasses, Hilaria mutica and H. cencroides, in Arizona. 



ITredinese. | — Pursuing his researches on the hetercecism of the 

 Uredineee, E. Fischer distinguishes three types of leptoform : — (a) forms 

 with two kinds of teleutospore, fixed, germinating at once, aud then 

 hibernating (Puccinia Veronicarum) ; (b) teleutospores of one kind only, 

 formed several times in the course of the year (P. Malvacearum) ; (c) 

 teleutospores of one kind only, formed only once in the course of the 

 year ; the ruycele hibernates in the leaves (P. Buxi, Chrysomyxa 

 Abieiis), or in buds which, in the spring, form teleutospore-bearing 

 shoots (P. Thlaspeos). A new hetercecious Puccinia is described, P. 

 Acfsese Agropyri, parasitic on Agropyrum caninam, and forming gecidia on 

 Actsea spicata. Other observations on parasitic Puccinise are recorded. 



Rabenhorst's Cryptogamic Flora of Germany, &c, (Fungi im- 

 perfecti). — With Part 75, A. Allescher commences the second volume of 

 this section of Kabenhorst's great work. The fifth division of the Sphae- 

 rioidea?, the Pheeosporeee, are characterised by their spherical, elliptic, or 

 ovate spores, unseptated, and olivaceous or rust-coloured. They comprise 

 the genera Sphseropsis (55 sp.), Coniotliyrium (109), Nsemosphsera (6), 

 Sirothecium (1 sp.), Levieuxia (1 sp.), Chsetom^lla (6), Haplosporella (19), 

 Cytoplea (1 sj).), and Discomy apsis (1 sp.). The sixth section, the Phseo- 

 didymse, are distinguished from the previous section by their uniseptate 

 spores. It comprises the genera Microdiplodia g. n., Diplod;ia, Macro- 

 diplodia, Clisetodii lodia, Diplodiella, Pellionella, and Botryodiplodia, of 

 which, in I'arts 76 and 77, the first genus is fully described, with its 

 102 sp., followed by Diplodia with 224, Macrodiplddia with 2, Chseto- 

 diplodia with 6, Diplodiella with 12, and JBolryodiplodia with 15 sp. The 

 7th section, the Pha3ophragmia3, is characterised by having elliptical 

 or fusiform rust or olive-coloured spores with two or more septa. It 

 comprises 8 genera, — Hcndersoiria, Couturea, Wojnowicia, Anqiopoma, 

 Cryptostictis, Prostltemium, and Hendersonula. Six species of Hendersonia 

 are described in this part. 



Hydnum.§ — H. J. Banker gives a monograph (with clavis) of the 

 species (40 in all) of Hydnum belonging to the section Mesopus, with 

 directions for collecting, preserving, &c. 



Mycorhiza of Arctic Plants. || — H. Hesselman has made a careful 

 study of the mycorhizae which infest the roots of arctic plants, and which 

 he finds to be very numerous. 



In all the species of Salix examined (about 18) he finds a mycorhiza 



* Fungus-diseases of Citrus Trees in Australia, Melbourne, 1899, 132 pp. and 

 31 pis. See Bot. Centralbl.. lxxxvi. (1901) p. 27G. 



t Bull. Torrey Bot. Club, xxviii. (1901) pp. 236-41 (2 tigs.). 



j Ber. Schweiz. Bot. Ges., x (1900) 9 pp.; and xi. (1901) 14 pp. See Bot. Zt<;., 

 lix. (1901) Abt. ii. p. U 8. Of. this Journal, 1899, p. 66. 



§ Bull. Torrey Bot. Club, xxviii. (1901) pp. 199-222. 



|| Bih. k. Svensk Vetensk.-Akad. Handl., xxvi., 46 pp., 3 pis., and 5 rigs. 

 (Swedish, with Germau abstr.). See Bot. Centralbl., lxxxvi. (1901) p. 239. 



