> 
R12 
epidermide rupta cincti; uredosporae ellipsoideae, leves, flavo- 
runneae, 20-23 x 16- 
18, episporio I-lhp 
crasso, poris. germina- 
: tionis non visis. Sori 
teleutosporifert — perfecte 
conformes, atro-brunnei; 
oe teleutosporae late ellip- 
soideae, utringue rotun- 
datae, apice non incras- 
satae, medio non con- 
strictae, verruculosae, im- 
maturae laete uavae, dein atro-castaneae, 35-45» x 28-35 p, 
episporia 4 p crasso, ex tunicis duabus composito, interiore tenui 
tenaci levi atro-brunnea, exteriore crassa brunneola molliore in- 
aequaliter grosse verrucosa plus minusve secernibili, pedicello” 
gracili hyalino deciduo sporam subaequante saepe oblique inserto 
praeditae. 
Tropican Arrica. Uganda: Mubango, 1220 m., Jan., 1915, 
Dummer 1344, on leaves of Pentas verticillata, var. pubescens. ° 
S. Moore. 
TELEUTOSPORES X° 600. 
This species seems to be intermediate between P. Pentadis, 
Henn. and P. Pentanisiae, Cooke, differing from the former in 
the verruculose external surface of the spore, and from the latter 
in the hypophyllous sori and thick epispore. 
XLIX.—HOST PLANTS OF SYNCHYTRIUM 
: ENDOBIOTICUM. 
Stupies rroM tHe Parnonogrcat Lasoratory: IV. 
A. D. Corton. 
the fungus Synchytrium endobioticum, Perc. Although, 
except for a few isolated spots, it is absent from the south of 
England, in many of the northern counties and in part of Scot- 
Jand it causes very serious loss, and in some localities it had 
become so virulent that a few years ago potato-growing in allot- 
ments and gardens had to be practically abandoned. With the 
discovery, however, of immune varieties potato-cultivation in 
these areas 1s being resumed, and the “seed” of high-class 
resistant varieties is so much in request that the demand at times 
sar ‘gptcae the supply. 
age in 7 € past as to im 
4) wrongly named “ seed,”’ or (6) to the presence of ‘‘ ro 
a,” gues, 
or (c) to the use of varieties mhzeh Auch formerly supposed 
