ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
321 
Parasites ; all the known species being fully described the higher and 
lower Fungi ; the Pathogenic Slime-Fungi (Myxomycetes) ; the Patho- 
genic Bacteria; the Pathogenic Algae. The book is admirably illus- 
trated ; and there is a copious index. It may be regarded as a complete 
monograph of the Fungi and other cryptogamic parasites which are 
pathogenic to plants. 
Rusts of Corn.* — Herr J. Ericksson sums up the present state of 
our knowledge respecting the species of Puccinia parasitic on corn-crops. 
There are now known 10 forms belonging to 5 r&puted species, viz. : 
(1) P. graminis, one form on rye and barley, another on oat, and a 
third on wheat ; (2) P. dispersa, one form on rye and another on wheat ; 
(3) P. glumarum , one form on rye, another on. wheat, and a third on 
barley ; (4) P. simplex, on barley ; (5) P. coronata, on oat. Of these 
10 forms it is only those of P. graminis on rye and barley which 
occur also on other kinds of grass, viz. both of them on Triticum repens, 
T. caninum , Elymus arenarius, Bromus secalinus, Hordeum jubatum, &c. ; 
the latter also on JDadylis glomerata, Alopecurus pratensis, Milium effusum, 
Arena elatior, A. sterilis, &c. He confirms observations already made 
as to the my coplasm- condition assumed by certain parasitic fungi. 
New Conidial Form of Chgetomium.f— On a Brazilian bark, M. E. 
Boulanger finds a hitherto undescribed fungus, which he names Dicyma 
ampullifera . Under certain conditions of culture, this fungus can be re- 
duced to an atrophied Sporotrichum form, while its most perfect form is a 
Chsetomium , which will develop only on banana-leaves or on wood. The 
perithece produced in this form is that of a Pyrenomycete belonging to 
the family of Sphaeriacese. The author names it Chsetomium Zopfii , 
Dicyma ampullifera being its conidial form. 
Venturia and Fusisporium.t — Dr. R. Aderhold gives a resume of 
the species of this family of Pyrenomycetes, the perithecial forms of 
which are known as Venturia , and establishes the connection with the 
respective conidial forms which comprise the genus Fusicladium. Several 
new species are described, including V. Tremulse, of which both forms 
are found on the leaves of the aspen, and F. Fraxini, both forms of 
which occur on leaves of the ash. 
Mycele of AScidium Magellanicum.§ — Herr P. Magnus has traced 
the growth of the mycele of this fungus in the wood, cortex, and pith of 
the “ witch-broom ” of the barberry, as well as that of the haustoria, 
and confirms previous statements as to the intercellular growth of the 
hyphse. It was not found in the cambium. 
Relation of Yeasts to Malignant Tumours.il— Dr. A. R. Defendorf, 
after reviewing the literature of cancer-bodies, most of which have been 
noticed in this Journal, considers that it is justifiable to draw certain 
conclusions as to the relationship of fungi to malignant tumours in man. 
The first is that the parasitic Protozoa described by numerous investi- 
* Ber. Deutsch. Bot. Gesell., xv. (1897) pp. 183-94. Cf. this Journal, ante, p. 61. 
f Eev. Gen. de Bot. (Bonnier), ix. (1897) pp. 17-26 (3 pis.). Cf. this Journal, 
1895, p. 557. 
X Hedwigia, xxxvi. (1897) pp. 67-83 (1 pi.). Cf. this Journal, ante, p. 152. 
■§ Ber. Deutsch. Bot. Gesell., xv. (18£7) pp. 148-52 (1 pi ). 
|| Trans. Amor. Micr. Soc., xviii. (1897) pp, 219-45. 
