82 
Leaves .—The leaves may wither at the tip, when nothing 
remains but shreds of the grey membranaceous epidermis studded 
with perithecia ; or other portions may have the dirty grey 
patches and the tissue become disorganized and destroyed. 
Branches and Stems .—Greyish blotches, usually on one side, 
at first isolated, then continuous in long lines, destroying and 
rupturing the tissues so as to expose the wood, aud with the un¬ 
injured tissue raised around. The terminal portions of the twigs 
usually die off, and the grey blotches may also appear at the base 
of the dead twigs, adjoining the still living green tissue. 
Roots .—The diseased portions are dark brown or almost black, 
and the pustules may occur either on the bark or whore denuded 
of the outer bark. 
Associated, and probably genetically connected, with this 
species, were several other fungi. 
Pleospora limonum (Penz.), found on languid leaves of Lemon, 
seems to represent the highest or ascomycetal stage, and Spo- 
rodesmium griseum (MeAlp), the conidial stage. (Plates VII. and 
VIII., and Figs. 35, 36, 37, 38, 39, 40.) 
18. CITRUS SPHJEROPSIS. 
(Sphmropsis citricola , n. sp.) 
Perithecia scattered or somewhat gregarious, minute, black, 
dark-brown by transmitted light, slightly erurnpent, sub-globose, 
about 13pp. diameter. 
Sporules dark-brown in mass, light-brown individually, thick- 
walled, elliptic, 5^-7i- X 4-4ip. 
On scab of Lemon and Lemon leaf produced by Cladosporium 
subfusoideum (McAlp). Wandin Yallock, Victoria; Parramatta, 
New South Wales. 
On scab of Lemon leaf. April, 1898. Cooroy, Queensland 
(Try on). 
On bark from stem of Lemon affected with “ Root-rot.” 
February, 1899. Doncaster, near Melbourne. 
Associated and intermixed with Diplodia citricola (McAlp). 
Only a few perithecia were mot with on the Lemon scab, the 
Diplodia being the principal form. 
On Lemon leaf from Queensland the perithecia occurred on the 
lower surface of the midrib, where it was slightly scabbed aud 
discoloured. 
On the Lemon stem the sporules were more nearly spherical, 
being on the average 5£ X 4ip. (Pigs* 41, 42). 
