79 
On Lemons from Doncaster and elsewhere, Victoria. 
There are various species of this scab-causing genus on Oranges 
and Lemons, but the present one is distinct from the shape, size, 
and colour of the conidia. The minute flakes readily carry the 
disease, hence its comparatively wide distribution. (Figs. 19, 
20 .) 
12. GREYISH-BROWN SCAB. 
(Cladosporium subfusoideum , n. sp.) 
Greyish-brown scab, overspreading green or yellow lemon, 
mostly on one side, cracking and becoming covered in patches 
with dusky layer. 
Ilyphae ascending, dark olive, septate, very sparingly branched, 
average 4/i. thick. 
Conidia produced at apex, similarly coloured to hypliae or 
paler, 1-3-septate, not constricted at septa, smooth, fusiform, or 
fitibfusoid, 12-15 x 3J,-4p. 
A Macrosporium form is occasionally associated with this, in 
which the conidia are dark-coloured, clavate, with transverse and 
longitudinal septa, 34-37 x 13-1 bp. 
On yellow Lemons, September, 1898, Warnlin Yallock, Victoria. 
On greon Lemons, February, 1899. Parramatta, New South 
Wales (Cairnes). 
The scab not only spoils the appearance of the fruit, but 
interferes with its proper ripening as well as its keeping qualities. 
Lemons thus affected soon become a prey to mould, as well as 
other fungi, such as Diplodia and Sphaeropsis found on the same 
scabby fruit. (Plate V. and Figs. 21, 22.) 
13. GREY SCAB OF ORANGE AND LEMON. 
(Sporodesmium griseum , n. sp.) 
Scab consisting of a dirty-grey incrustation, either continuous 
or scattered, and cracking into irregular areas. Ilyphae of at 
least two kinds. 
(a) Colourless to pale-green creeping hyphae, septate, seg¬ 
ments elongated and cylindrical, slender, about 2p. broad, 
bearing at their apex— 
Conidia same colour as hyphae, elliptical, 5-^-0-},- x 3i—4 p. 
(5) Dark olive-green hyphae, very irregular, and often ag¬ 
gregated in isolated masses, thin-walled and segments elongated, 
or thick-walled and segments rounded, often muriformly divided. 
Conidia of the same colour, and either Cladosporium-liko and 
uni-septate, or 2 to 3—septate and oblong, or obovate, some¬ 
times with longitudinal septa, size up to 21 x 9/i. 
