Fungi, Myxomyceten, Pathologie. 
511 
viz. species previously reported 22, and species now reported for 
the first time 8. References to previous publications are also cited in 
foot notes. Raymond J. Pool. 
Butler, E. <J. & H. M. Lefroy. Report on trials of the South 
African Locust Fungus in India. (Agricultural Research In¬ 
stitute, Pusa, Bulletin 5. 1907.) 
Experiments with Mucov exitiosus, Massee. The fungus appeared 
incapable of making good growth (even when inoculated into 
wounds) on the locusts Acridium succinctum or A. aeruginosum ; but 
it will grow to some extent on A. peregrinum. No infection resulted 
from spraying spores on healthy locusts, even when the latter were 
kept in a moist atmosphere. For practical purposes the fungus is of 
no value. A. D. Cotton (Kew). 
Evans, S. B. Pole The Cereal Rusts. 1. The development 
of their Uredo mycelia. (Annals of Botany. XXI. p. 441—463. 4 
Plates. Oct. 1907.) 
A comparative histological study of the Rust Fungi ( Uvedineae ) 
of Cereals has been undertaken by the author; in the present com- 
munication he brings forward his observations on the Uredo-stage. 
The subject is dealt with in the broadest manner, all the spe¬ 
cies known to occur on cereals having been examined. In following 
out the development of the Uredo mycelia from spore-germination 
to spore-production three stages may be recognised, 1) the attack 
by the parasite on its host, or the first phenomenon of occupation, 
2) the course taken after occupation by the further growth of the 
parasite, and 3) the reaction on the host after occupation, and the 
subsequent reciprocal action of host and parasite. 
The present paper, which deals chiefly with the first of these 
three stages, shows that each set of infection-phenomena are of a 
very definite nature for each species of Uredo. The different species 
are first dealt with individually and at the end the main facts as 
to each are summarized in tabularform. An abridged account of the 
latter is given below. 
P. graminis. Germ-tubes 2; appressorium well defined; sub- 
stomatical vesicle cylindrical, non-septate, 27 u long X 9 diam., 
hyphae 3*5 thick. 
P. Phlei-pratensis. Germ-tubes 2; appressorium ill defined; ve¬ 
sicle cylindrical, non-septate, 5—7 ( u diam., with one infecting 
hypha; hyphae 3 ,« thick. 
P. glumarum. Germ-tube unbranched; appressorium absent; ve¬ 
sicle oval, non-septate, 18—19 ,u diam., with one infecting hypha; 
hyphae 10—19 thick crammed with nuclei. 
P. dispersa. Germ-tube branched; appressorium well defined; 
vesicle cylindrical, septate, 11 —14 u diam., infecting hyphae 2; 
hyphae 3—5 /i thick, nuclei arranged in single file. 
P. tviticina. Germ-tube branched; appressorium well defined; 
vesicle spherical, non septate, 15 ,u diam., with 1 infecting hypha; 
hyphae 3'5 u thick. 
P. symphytibromoram. Germ-tube generally branched; appresso¬ 
rium variable; vesicle triangulär, non septate, with 1 or 2 infecting 
hyphae; hyphae 3-5 thick; hammer-headed haustoria frequent. 
P. Simplex. Germ-tube rarely branched; appressorium ill defined; 
vesicle cylindrical, multiseptate, 12—14 ,<» diam., with 4 or more in- 
