86 
23. POINTED SPHiERELLA. 
(Sphwrella sicula , Penz.) 
Very minute, densely gregarious, punctiform pustules, standing 
out like the pile in velvet, on both surfaces of leaf but mostly 
on underside, on greyish patches, blackish from the numerous 
points. 
Pcrithccia covered by the raised epidermis, depressedly globose, 
membranaceous, with circular mouth. (19-20/x. diam.). 90—120^. 
Asci fasciculate, without paraphyses, elongated-fusoid to cylin¬ 
drical, sub-sessile, somewhat truncate at apex, 8-spored, 37-43 X 
5-6 ^. 
Sporidia distichous, hyaline, fusoid, 1-septate, not constricted 
at septa, 10-11 x 3-3J-/1. 
On fallen and decaying leaf of Orange. October, 189< . Gem- 
brook, Victoria. 
The perithecia reached a size of 120^. instead of 90p., and the 
asci averaged 40/<. long instead of 26/x., but otherwise there was 
agreement with the above species. 
It was found closely associated with Pleospora herbarum (Rab.) 
and the epidermis around it had sometimes a puce tint. (Figs. 
54, 55.) 
24. DESTROYING PLEOSPORA. 
(Pleospora disrupta, n sp). 
Perithecia scattered or somewhat gregarious on irregularly- 
shaped dingy ashen-grey blotches, either small or becoming large 
patches (1 inch or more) and destroying tissue of leaf. Minute, 
black, immersed, spherical, with relatively largo mouth, average 
150/x. diam. 
Asci oblong-clavate, rounded at apex and abruptly tapering at 
base, 8-spored, without paraphyses, 60-75 x 24—34/x. 
Sporidia, 2 to 3 rowed, bright, yellowish-green, elongated ellip¬ 
soid, 5-septate, constricted at septa, with longitudinal divisions 
37-40 x 13-15/x. 
On green leaves of Orange. March, 1899. Burnley, near 
Melbourne. 
The tissue of the leaf is completely disorganized by the fungus 
and ultimately it is reduced to the upper epidermis of the diseased 
patch, which finally falls away. The specific name is given from 
the way in which portions of the leaf affected are broken up and 
destroyed. 
This species differs from P. lies peri dearum (Catt.) occurring on 
Citrus fruits, in the asci being only about half the length and the 
narrower sporidia. There is a conidial form associated with this 
which I have named Macrosporium disruption. (Figs. 50, 51, 52.) 
