832 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
lettuces produced by a species of Botrytis ( Bolyactie ). The mildew of 
cucumbers, caused by Erysiphe Cichoriacearum. A new disease of 
potatoes which attacks the leaves, and is due to a Macrosporium . A 
second cucumber-fungus belonging to the genus Acremonium. The 
mildew of celery, caused by Cercospora Apii. Two parasites of clover, 
Vromyces Trifolii and Polythrincium Trifolii. A disease of the black 
poplar, due to Melampsora populina. An anthracnose of the chestnut, 
produced by Mar sonia ochroleuca. 
Meliola.* * * § — M. A. Gaillard publishes a monograph of this genus of 
foliicolous Perisporiaceae, of which he enumerates 109 species, a con- 
siderable number of them new. The genus is divided into two sections ; 
in the first, characterized by the asci being ovoid or globular, which 
includes by far the greater number of the species, they are again 
classified according as the spores are divided into 2, 3, or 4 chambers. 
The second section, in which the asci are club-shaped or cylindrical, 
includes only 3 species ; in one of these the spores have 3, in another 
4, and in the third 5 chambers. 
Sclerotes of Vaccinium and Rhododendron.! — Herr E. Fischer 
describes the sclerotes produced on Vaccinium Myrtillus and vitis-idsea by 
Sclerotinia Vaccinii and baccarum ; also a very similar one on the fruits 
of Bhododendron ferrugineum and Jiirsutum, caused by an allied fungus 
to which he gives the name Sclerotinia Bhododendri. 
Germination of Teleutospores of Ravenalia.f — Mr. B. M. Duggar 
describes the little-known germination of the teleutospores of Bavenalia 
cassisecola. It differs from that of such typical genera as Puccinia in 
the non-septate character of the promycele, which obtains in all species 
except those in which germination takes place in abundance of water. 
The sporids are produced at or very near the end of the jrromycele, and 
in lateral branches which have the usual characters of sterigmas. 
Puccinia Agropyri.§ — Herr P. Dietel identifies this uredo-form, 
parasitic on Agropyrum glaucum , with AEcidium Clematidis, parasitic on 
Clematis Vitalba , and not with Melampsora populina , as suggested by 
Rathay. 
Macrosporium sarcinseforme Cav.|| — Sig. F. Cavara describes a 
new parasite of red clover which was discovered in the neighbourhood 
of Pavia. Very slender uncoloured septate hyphae grow into the 
parenchyme of the leaf and produce at first uncoloured, afterwards 
brownish-yellow spots. On the under side of the leaf hyphas grow out, 
and from these are formed conidiophores 1*4-1 ’8 p long. The apical 
cell enlarges and assumes the form of a ball, in which transverse and 
horizontal partitions appear. If the spots are numerous they may unite, 
and the leaf withers away, so that fields attacked by this parasite are 
* ‘ Le genre Meliola,’ Paris, 1892, 164 pp. and 24 pis. See Bull. Soc. Bot. France, 
xxxix. (1892), Rev. Bibl., p. 76. Cf. this Journal, ante, p. 652. 
f Mttl. Naturf. Gesell. Bern, 1891, 2 pp. ; see Bot. Centralbl., 1892, Beih., 
p. 315. Cf. this Journal, 1889, p. 263. 
% Bot. Gazette, xvii. (1892) pp. 144-8 (2 pis.). 
§ Oesterr. Bot. Zeitschr., xlii. (1892) pp. 261-3. 
/| La Diffesa dai parassiti, 1890, No. 4. See Centralbl. f. Bakteriol. u. Parasi- 
tenk., xi. (4892) p. 705. 
