83 
19. CITRUS DIPLOPIA. 
(Diptodia citricola , n. sp.) 
Perithecia gregarious, minute, punctiforra, slightly erumpent, 
black, golden-brown by transmitted light, sublenticular with 
distinct papillate pore, 180-200 X 150-170//. 
Sporules at first colourless and continuous, finally brownish in 
mass, uniseptate, not constricted at septa, elongated elliptic, 
rounded at both ends, 6-8 x 2^-3i/z. 
On Lemon scab caused by Cladosporium, subfusoideum (MeAlp). 
Wandin Yallock, Victoria, September, 1898 ; Parramatta, New 
South Wales, February, 1899. 
On green Lemons. March, 1899. Burnley, near Melbourne. 
On Knight’s Citron fruit, leaves, and twigs. Burnley, near 
Melbourne. 
On Lemon stem, associated with “Collar-rot.” April, 1899. 
Malvern, near Melbourne. 
On Lemon twigs and stem. July, 1899. Doncaster, near 
Melbourne. 
This fungus was found to be more common in wet than in dry 
situations, and occasionally limbs of a tree were killed by it, 
according to one grower ; but generally it seemed to be saprophytic 
and associated with other fungi. (Plate V., Figs. 43, 44.) 
20. BROWN BLOTCH OF LEMON. 
{Septoviu depressa , n. sp.) 
Depressions on skin of Lemon, brownish to blackish, irregu¬ 
larly circular, glistening when fresh, may be either dark towards 
the centre and ruddy-brown towards the circumference, or the 
reverse, varying in size from £-inch to 1 inch in diameter, and 
several may run together. Perithecia minute, punctiform, 
immersed, black, in small groups, globular to sub-globose, opening 
by pore, about 112//. diameter. Sporules hyaline, sub-cylindrical, 
straight or slightly curved, usually 1-septate, sometimes slightly 
constricted at septum, with rounded ends, average 15 x 2//., but 
varying in size from 13-19 X l?,--3£/z. 
Disfiguring the skin of Lemons and Citrons. Doncaster and 
Burnley, uear Melbourne. 
It differs from S. citri (Pass.) in the larger perithecia and iu the 
sporules, being curved as well as straight, but not fusiform. 
It approaches Ascochyta in its characters. 
This is a disease which occurs oil the best lemons, usually 
attacking them when ripe. It seems to agree with Red Blotch 
of the Lemon described by Dr. Cobb, in Ag. Gaz ., New South 
Wales, Vol. VI., Pt. 12, p. 864 (1895), but in the absence of 
details as to perithecia, &c., nothing definite can be stated. 
F 2 
