448 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
TJstilago Carbo.* * * § — Herr P. Herzberg has studied the development of 
the seven species into which this rust is now divided, and classifies them 
in two groups according as they germinate from a mycele or a promycele, 
the latter being simply a form of mycele with early production of spores. 
To this group belong TJstilago Jensenii , Avense, and perennans ; while 
TJ. Hordei and Tritici produce sterile myceles, and are formed into a new 
genus Ustilagidium. In nutrient solutions all the species produce 
chlamydospores, which again germinate into myceles. 
(Edomyces leproides.f — Prof. P. A. Saccardo and Dr. O. Mattirolo 
have studied the development of this fungus, parasitic on beet-root, and 
have determined that it must be placed in the Ustilagineae, near to 
Entyloma. 
Exobasidium.‘| — Mr. H. M. Richards has investigated the life-history 
of several species of this genus of parasitic fungi, and the nature of the 
distortions which it causes on the host-plant. He comes to the conclu- 
sion that E. Andromedse , parasitic on Andromeda ligustrina, is, in all 
probability, but a form of E. Vaccinii, which occurs on several genera of 
Vacciniaceee and Ericacete. The form and extent of the hypertrophy 
caused by the parasite appear to depend on the host, and on the age of 
the tissues affected. 
Fructification of Lachnea.§ — Sig. F. Morini has followed out the 
development of Lachnea hirta, belonging to the Ascomycetes. The 
archicarp originates from an internal cell of the mycelial ball. From 
the archicarp is derived a single ascogenous cell, and from this spring 
the ascogenous liyphae. The author considers that his observations con- 
tribute a further confirmation to the view that the ascus of the Asco- 
mycetes is not derived from sexual ascogenous cells, the function of 
these cells being simply the nutrition of the asci. 
Parasitism and Saprophytism of Ascochyta Pisi. || — This fungus, a 
common parasite on the field-pea, Dr. M. Jarius found could also be 
grown by infection on various other leguminous plants, though not with 
the same luxuriance. Cultivation in various artificial nutrient solutions 
showed that it will also grow easily and luxuriantly, especially in those 
which are rich in proteias and in easily soluble carbohydrates, where it 
developes abundance of pycnids ; but that when the proteids are in excess, 
the formation of reproductive organs is suspended, and only the vegeta- 
tive organs attain a luxuriant development. This is especially striking in 
cultures in peptone-gelatin. 
Rabenhorst’s Cryptogamic Flora of Germany (Fungi).lf — The third 
section of the first volume of this work is now complete, and comprises 
a monograph of the mid-European species of the Hysteriaceae and 
Discomycetes by Dr. H. Rehm. In the three concluding parts the 
Ascobolese are completed with the genera Thelebolus (3 sp.), Zukalina 
* Beitr. z. Phys. u. Morph, niederer Organismen (Zopf), Heft 5, 1895, pp. 1-36 
(1 pi.). f Malpighia, ix. (1895) pp. 459-68 (1 pi.). 
% Bot. Gazette, xxi. (1896) pp. 101-8 (1 pi.). 
§ Malpighia, x. (1896) pp. 92-9 (4 figs.). 
|| Biblioth. Bot., Heft 34, 1896, 21 pp. and 1 pi. 
«([ Erster Band, 3 te Abtheil., Leipzig, 1896, 1275 pp. and numerous figs. Cf. this 
Journal, 1895, p. 344. 
