99 
It differs from A. cinerea in tho smaller size of the peritliecia 
which are scattered and seated on dark-coloured patches. Also 
from A. hombycina (Penz. and Sacc.), with which the sporules 
generally agree in size, in their not being constricted at the 
septum, and tho spots not being yellow. 
Occasionally a 2-septate sporule may be seen as drawn 
(16 X 4£p.). 
Associated with this fungus wore dark-coloured patches, con¬ 
sisting of olivaceous, sometimes almost colourless, septate, 
branched, hyphce, often constricted at tho septa, ramifying in the 
bark and spreading on the surface like a felt, and producing— 
1. Similarly coloured uniseptate eonidia at the apex of the 
liyphae ( Cladoxporhim) or occasionally— 
2. Elongated clavate eonidia, transversely and longitudinally 
septate ( Macrosporium) but mostly— 
3. Dense aggregates of dark-olive cells ( Coniothecium ). 
Sometimes the dark mouldy stage was the most con¬ 
spicuous feature. 
Two specimens obtained quite independently, one on twigs of 
Lisbon Lemon, from South Australia, and one on Orange leaf 
from Armadale, near Melbourne, with the same association of 
moulds, show that there is very probably some intimate connexion 
between them. (Figs. 91, 92.) 
51. CITRUS IIENDERSONIA. 
{Rendersonia citri , n. sp.) 
Very minute, black, gregarious, punctiform pustules on orbi¬ 
cular greyish spots, with distinct ruddy-brown margin. Peritliecia 
golden-brown by transmitted light, depressed globose, immersed 
then slightly erumpent, membranaceous, with apical pore, 
150-19Op. diam. 
Sporules smoky-brown, 3-septate, not constricted at septa, elon¬ 
gated elliptic, very distinctly hi- and tri-guttulate, 9i-l 1 x 3i-4p., 
average 10 x 3£p. 
On leaf of Bitter Orange. July, 1896. Kew, near Melbourne. 
'fhe median septum is always the darkest and most distinct, as 
it is the first division of the sporules, and large numbers in tho 
same peritliecia are still at that stage. Then a faint septum 
appears in the upper and lower half, and the mature tri-septate 
spore is formed. Tho guttules are very pronounced, especially 
in the younger uni-septate stages. 
This was found on the same leaf as Pyrenocliaita destructiva, 
but at a different spot, and completely destroyed the tissue there. 
This is the first record of the genus on the Citrus family. (Figs. 
93, 94.) 
G 2 
