ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 479 



him from Morioka, Province Rikuchu. Salmon's determinations are 

 made on morphological lines, and by this means he brings together 

 very diverse hosts. He finds a new variety of the gooseberry mildew, 

 Sphmrotheca mors-uvm, growing on leaves of Stephanandra ; several new 

 varieties are described, and in many cases new hosts for species already 

 known. He appends an alphabetical list of the hosts, with their parasites. 



Two little-known Myxosporiums.* — C. "W. Edgerton describes two 

 fungi, one parasitic on Liriodendron tulipifera, the other on apple and 

 pear trees. He considers them new species of the genus Myxosporium. 

 A general account is given of bark-canker of apple and pear caused 

 by the fungus, and contrasts are drawn with those that cause rot. The 

 species on Liriodendron is also described ; the twigs on which it grew 

 were dead, though it was not ascertained that the fungus had killed 

 them. Edgerton calls his new fungi Myxosporium corticolum on apple, 

 and M. longisporum on the tulip tree. 



Research on Fungi imperfecti.f — K. Klebahn has experimented 

 with the fungus Septoria piricola, a parasite on the leaves of Pyrus com- 

 munis. He describes the action of the mycelium on the host-plant, and 

 the conidia of the fungus, comparing them with other species recorded 

 on the same leaves, Depazea piricola and D. pyrina, Septoria nigerrima, 

 S. Pyri, and also S. dealbata, all of which he finds to be synonymous 

 with S. piricola. The ascus form, Mycosphcvrella sentina, is also de- 

 scribed. Leaves of Pyrus were infected with the ascospores, and 

 pycnidia were produced ; cultures were also made on plum-agar, and the 

 pycuidia of Septoria piricola were again formed. 



Hyphomycetes.J — G. Lindau's latest fascicle deals with a series 

 of genera characterised by brown muriform conidia of varying form, 

 a difficult group to arrange. One subdivision is made to consist 

 of but one genus, Sirodesmium, distinguished by its muriform spores 

 borne in chains on a very short stalk. Lindau retains both Dictyo- 

 sporium and Speira, very closely allied genera. Stemphylium, Mystro- 

 sporium, and Macrosporium form another well-nigh inseparable trio of 

 genera, badly differentiated. As usual the genera are well illustrated, 

 though more figures would have been welcome. 



Systematic Position of Achorion and Oospora.§ — F. Gueguen has 

 produced in his cultures of Oospora chlamydospores and spiral hyphaa, 

 with two to five spirals, which break up into smaller portions, something 

 like a letter S or small open rings. He has also demonstrated by his 

 cultures that Oospora has a septate mycelium, which removes it from 

 the Microsiphoneae. Gueguen finds that spirals are characteristic of the 

 Gymnoasceas, and for that and other reasons he considers Oospora a 

 conidial form of that group. He places Achorion, which is allied to 

 Trichophyton, in the same systematic group as Oospora. 



* Ann. Mycol., vi. (1908) pp. 48-53 (2 figs.). 

 t Zeitschr. Pflanzenkr., xviii. (1908) pp. 5-17 (1 pi.), 



J Rabenhorst's Kryptogamen-Plora, i. abt. 9, lief. 108 (Leipzig, 1908) pp. 

 177-240. § C.R. Soc. Biol. Paris, lxix. (1908) pp. 852-4. 



