100 
52. SOCIAL IIENDERSONIA. 
(Hender&onia socia , n. sp.) 
Numerous minute, black, scattered punctiform pustules on 
withered margin of leaf or on bark still green. 
Peritbecia immersed, sub-carbonaceous, depressed-globose, 
dark-brown by transmitted light, with apical pore, 170-220/*. 
diam. 
Sporules smoky-brown, 3-septate, often slightly constricted at 
septa, ellipsoid to oblong, 14-17 x 5-9 //., average, 15 X 5^/*.; 
basidia hyaline, short, 2-3.Jp. broad. On Lemon leaf. May, 
1899. Burnley, near Melbourne. On bark of Lemon towards 
base. July, 1899. Doncaster, near Melbourne. 
It differs from II. citri (McAlp.) in not being situated on distinct 
spots of the leaf, and in the sporules being slightly constricted, 
longer and broader. This species seems to bo essentially social 
in its nature. On the leaf it was associated with Diplodia 
destruens (McAlp.), Fusarium roseum (Liuk), and Coniolhyrium 
cervinum (McAlp.). It was found on the Lemon stem,associated 
with “root rot ” and various other fungi, at Doncaster, and at 
Ardmona it occurred on the bark splitting from the trunk at the 
collar of a dying Lemon tree, associated with Phoma ornnivora 
and Ascochyta Limoni . (Figs. 95, 96.) 
53. WITHERING SEPTORIA. 
(Sejitoria flaccescens , n. sp.) 
Numerous minute, black, punctiform, semi-immersed, crowded 
pustules on upper surface of brown and withered tips of Orange 
leaves, adjoining green tissue. 
Hypbae yellowish-green, septate, branched, 3ip. broad. 
Peritbecia, amber-colourcd with greenish tint, depressed globu¬ 
lar to lenticular, with circular pore, 120-150/*. or even 200/*. 
diam. 
Sporules hyaline, cylindrical, straight or slightly curved, rounded 
at both ends, very occasionally uniseptate, vacuolated protoplasm, 
variable in length, average, 11-15 X 3-8£n. 
On upper surface of Orange leaves, causing withering at the 
tips. October, 1898. Near Melbourne. 
It differs from S. citri (Pass.) in the larger peritbecia not being 
situated on disc-like spots, and in the stouter sporules. (Figs. 
97, 98.) 
