ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
659 
iEcidium graveolens.* — Herr P. Magnus lias studied the develop- 
ment of the fungus which produces the “ witch-broom ” of the barberry, 
and describes the deformation caused by it in the tissues of the host- 
plant. He now identifies it as the aecidioform of Puccinia Arrhenatheri , 
and designates it 2E:idium grciveolens Shuttlew., instead of the usually 
accepted name A. magellanicum, which belongs to a fungus growing on 
Berberis ilicifolia from the Straits of Magellan. 
Roesteliae producing Mycocecidia.f — M. L. Geneau de Lamarliere 
discusses the various mcidioforms of Gymnosporangium in reference to 
their life-history, and the host-plants of both forms, which he classifies 
as under : — 
JEcidia. 
Teleutospores. 
Roestelia cancellata on the pear. 
Gymnosporangium fuscum (= G. Sa- 
binse ) on Juniperus Sabina, J. Oxy - 
cedrus, J. virginiana, J. phoenicia, 
and Pinus Halapensis. 
Roestelia ... on Cydonia vulgaris , 
Crataegus oxyacantha, and Mespilus 
germanica. 
Gymnosporangium confusum on Juni- 
perus Sabina. 
Roestelia lacerata on Cratsegus oxya- 
cantha. 
Gymnosporangium clavariseforme on 
Juniperus communis. 
Roestelia cornuta and R. penicillata on 
Pyrus Malus, Sorbus Aria , S. Aucu- 
paria, and S. Cliamsemespilus. 
Gymnosporangium tremelloides (= G. 
conicum and G. juniperinum) on 
Juniperus communis and J. nana. 
The changes produced by the cecidia in the tissues of the host-plant 
are described in detail ; hypertrophy is displayed especially in the 
cortex and homologous tissues, as the lacunar tissue of the leaf. The 
cecidia produced by different species of the same genus, and having the 
same mode of life, have the same structure, with only differences in 
detail, on host-plants belonging to the same family, these being always 
arborescent Kosaceae. 
Bestoration of Spore-formation in Alcohol Yeasts. :}: — M. W. Bei- 
jerinck — who had previously noticed that in Saccharomyces octosporus 
the asporogenous cells reproduce asporogenous cells only, while the 
spores give origin to both sporogenous and asporogenous cells — now 
extends this observation to colonies. Thus, yeast-colonies which are de- 
rived from spores reproduce spores in their turn, and the more spores 
there are in a colony the more there will be in those cultivated from it ; 
while cells originating from spore-free colonies produce asporogenous 
colonies. 
* Ann. of Bot., xii. (1898) pp. 155-63 (1 pi.). Cf. this Journal, 1897, p. 321. 
t Rev. Gen. de Bot. (Bonnier), x. (1898) pp. 225-37, 276-88 (2 pis. and 5 figs. 
X Centralbl. Bakt. u. Par., 2 ,e Abt., iv. (1898) pp. 657-63, 721-30 (1 pi.). 
