98 
49. DESTROYING DIPLODIA. 
(Diplodia destruens , n. sp.) 
Minute, black, puuctiform pustules, on scabby portions of 
leaves, or on dirty-grey patches, with ruddy-brown margin, at 
first’running in irregular lines, ultimately expanding, and decayed 
tissue falling out. 
Perithecia somewhat gregarious, immersed, dark-brown by 
transmitted light, depressed globoso or elliptical, with minute 
apical pore, 150 - 170 /i. diain. 
Sporules yellowish-brown to smoky-brown in mass, pale and 
transparent individually, elliptical, 1-septat.e, not constricted at 
septa, straight, average 10 X 4p. 
On Orange leaves. September, 1892. Burnley, near Melbourne. 
June, 1.895. Mount Remarkable, South Australia (Molineux). 
On Lisbon Lemon leaves. May, 1899. Burnley, near Melbourne. 
It approaches D. citricola found on Lemon scab, but the sporules 
are longer and broader. 
Mr. Molineux in sending the specimens remarks that many 
trees are similarly affected in the same locality. The leaves 
have yellowish-brown scab-like patches on their upper surface, 
often become withered and torn up, and have a general sickly 
appearance. In the Burnley specimens the tissue affected 
became grey, and fell out, and the leaves were much paler iu 
colour than the normal. 
In young perithecia the sporules are all continuous and 
olivaceous, and might be readily mistaken for Goniothyriuni 
olivaceum (Bon.), var. hesperidum (Penz,). (Figs. 89, 90.) 
50. CITRUS ASCOCIIYTA. 
{Ascochyta citricola , n. sp.) 
Perithecia seated on dark-coloured patches of bark, which run 
in lines and coalesce, and on irregular pale-brown patches on 
leaves which ultimately decay and fall away. 
Perithecia yellowish-brown, punctiform, scattered or somewhat 
gregarious, globose, membranaceous, about 80-140p. diam., with 
conspicuous papillate mouth, averaging 20p. diam. Sporules 
hyaline, or a pale transparent greenish tint, uniseptate, narrowly 
elliptic, rounded at both ends, not constricted at septum, 9-11 X 
3-4 Jp.; average, 10 X 3ip. 
On twigs of Lisbon Lemon. September, 1898. South Australia 
(Quinn). 
On withered tip and marginal portions of Orange leaf. 
January-July, 1899. Armadale, near Melbourne. 
On ashy-grey blister-like patches on Lemon leaf. August, 
1899. Burnley, near Melbourne. 
