88 
the roots ns well as on other parts of the tree, for the spores could 
readily bo carried into the soil by the rain, &e., and there attack 
the fresh tips of the feeding roots. 
Penzig first described this in 1882 as P. media (Niessl), which 
also occurs on dead and dry stems of various species of plants. 
Thon Saccardo, in 1883, constituted it a variety Limonum , prin¬ 
cipally from its occurring on languid leaves and not on dead por¬ 
tions of the Lemon. Its occurrence, however, is so different from 
that of P. media , and its connexion with P. omnivora is so marked, 
that it seems to me worthy of specific rank, accordingly it is 
named P. limonum (Penz.). (Figs. 115, 116, 117, 118, 119, 
120 .) 
27. SCABBING RAMULARIA. 
(Ramularia scabiosa , Me Alp, and Try on.) 
Spots well defined, light-brown, circular, with waved margin, 
about 2mm. (liana., border slightly raised, and in old specimens 
ultimately black ; central area depressed, darker in colour than the 
rest ; finally raised with the whole spot, which becomes uniformly 
brown, much above surface of leaf. 
Fertile hypha? tufted, free, erect, simple, sometimes continuous, 
but usually obscurely septate, even, or constricted here and there, 
for the most part straight, pale-coloured to hyaline, containing 
granules* and longer than conidia. 
Conidia similarly coloured, terminal, single, or sometimes two 
in succession, cylindrical, ends obtuse, 8-9 X 2 p., L-septato, each 
division guttulate and containing granules. 
On both surfaces of living leaves and on petioles of Oranges 
and Lemons. Common at Toowoomba and South Queensland 
(Try on). 
This species is fully described by H. Tryon in his “ Report on 
Insect and Fungus Pests,” pp, 144, 145, Queensland, 1889. 
P. citri (Penz.). is entirely different from this species in 
producing no spot, in the conidia being rarely 1-septate, and 
8-14 x 3^-4p., and in occurring only on dry and fallen leaves 
(of Orange). (Fig. 56.) 
28. CORRUGATING CLADOSPORIUM. 
(Cladosjwrium corrugatim, n. sp.) 
Forming densely crowded, confluent, black olivaceous tufts on 
both surfaces of leaf, on oval or large irregular (lark-grey patches, 
with ruddy-brown margin on upper surface, and of a yellowish- 
brown on under surface. 
Hypha! olive-green, septate, sparingly branched, often curved, 
radiating, 5^l. broad. 
