836 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
New American Helicosporae.* * * § — Mr. A. P. Morgan describes a new 
genns of Helicosporae, a group of Hyphomycetes, Helicoon , with the 
diagnosis, — Hyphae various ; spores very large, spirally coiled into an 
elongated ellipsoidal body ; and the following new American species, — 
Helicomyces gracilis , H. bellus, H. scandens, H. clarus , H. elegans, Heli- 
coma larvale, H. ambiens, H. polysporum , H. repens, H. limpidum , H. am- 
biguum, Helicoon sessile. 
Cortinarius.'j' — Herr M. Britzelmayer gives a monograph of this 
genus of Agaricineee, which he divides into the subgenera Phlegmaeium, 
Myxacium, Inoloma, Dermocybe, Telamonia, and Hydrocybe. 
M. Boudier J describes a peculiar form of Cortinarius scutulatus , 
with all the habit of a Morchella, the surface being covered with deep 
pits, on the margins of which were isolated filaments, giving the pileus 
a woolly appearance. 
Hydnum Schiedermayri, a Parasite of the Apple.§ — Hr. F. v. 
Thiimen describes this little-known disease of the apple-tree, which 
imparts a light greenish-yellow colour to the wood, and is distinguished 
by a characteristic odour of anise. 
Rabenhorst’s Cryptogamic Flora of Germany (Fungi). — Parts 37 
and 38 of this publication continue the accounts of the Pezizaceae. 
The Pyrenopezizeae comprise the genera Pseudopeziza, Fabrsea, Pyreno - 
peziza (42 species including several new), Pirottsea, Beloniella , and 
Velutaria. The next suborder, the Helotieae, is divided into the sections 
Pezizelleae, Cyathoideae, Hymenoscypheae, and Sclerotieae. The Pezi- 
zelleae comprise the genera Pezizella (61 species, several new), Belonium, 
Gorgoniceps, Friopeziza , and Arachnopeziza. Of the Cyathoideae, the 
preseut numbers include only the first genus PJiialea. 
Part 51 (Phy corny cetes) commences with a general description of 
the Peronosporeae, made up of the genera Pythium, Pliytophthora , Cys- 
topus , Basidiophora , Plasmopora, Sclerospora , Bremia , and Peronospora. 
Of the genus Pythium 12 species are admitted, one new, of Phytophthora 2, 
of Cystopus 6, of Basidiophora 1, of Plasmopora 10, of Sclerospora 1, of 
Bremia 1. The illustrations are numerous and excellent. 
Mycetozoa. 
New Myxomycetes, causing Vine-diseases. || — MM. P. Viala and 
C. Sauvageau have investigated the cause of a widely spread disease 
of the vine known in the South of France as brunissure , and find it due 
to an undescribed Myxomycete nearly allied to the Plasmodiophora 
Brassicse of the cabbage, to which they give the name Plasmodiophora 
Vitis. It attacks the leaves only, in the form of brown spots on the 
upper surface, weakening the shoots and causing delay in the ripening 
of the fruit. The parasite developes chiefly in the palisade-cells, 
* Journ. Cincinnati Soc. Nat. Hist., xv. (1892) pp. 39-52 (21 figs.). 
f Bot. Centralbl., li. (1892) pp. 33-42. 
% Bull. Soc. Mycol. France, vi. (1890) pp. 169-73 (1 pi.). See Bot. Centralbl., li. 
(1892) p. 105. 
§ Zeitschr. f. Pflanzenkrankheiten, i. (1892) pp. 132-4. See Bot. Centralbl., 
1892, Beih., p. 315. || Comptes Rendus, cxiv. (1892) pp. 1558-60. 
