Some Tomato Diseases. F. T. Brooks and G. O. Searle. 185 
PYCNOSPORES. 
SHAPE. 
SEPTATION. 
GUTTULATION. 
SIZE. 
PYCNIDIA. 
PYCNOSPORES. 
SHAPE. 
SEPTATION. 
GUTTULATION. 
SIZE. 
PYCNOSPORES. 
SHAPE. 
SEPTATION. 
GUTTULATION. 
SIZE. 
PYCNOSPORES. 
SHAPE. 
Description given by 
Miss Jamieson (q.v.) 
not beaked, ostiolate (usually 
one sometimes two pores), 30— 
350 in diameter. Pycnidial 
wall thin, outer cells brown, 
inner cells hyaline; delicate 
filiform basidia arising from 
inner cells. 
Issue in coils through ostiolum 
forming a shiny flesh-coloured 
exudate... hyaline. 
Sub-cylindrical to sub-globose, 
rarely tapering. 
Continuous. 
2-guttulate. 
2°8 w-8°5 wx 1°7 u-3°4 
Description of authors’ 
cultures 
usually globose but irregular 
shapes seen, light yellowish 
brown, ostiole surrounded by 
a dark circle. Erumpent 
through the epidermis. 
Issue in coils through the 
ostiolum. Hyaline. 
Sub-cylindrical with rounded 
ends, occasionally slightly 
asymmetrical. 
Non-septate. 
Rarely faintly biguttulate. 
35 M-55 mx 2u-Zm. Very 
uniform in size. 
Form B. 
Pycnidial characters as to shape, size and colour varied so 
much as to seem unreliable for diagnostic purposes and are 
omitted in this and other forms. 
Issue in coils through the ostiolum. Hyaline. 
Ovate, usually slightly asymmetrical on one side and often 
slightly pointed at one end. 
Non-septate. 
Bi-guttulate. 
354-75 “xX 2 u-3'5u (20 measurements). 
walled appressoria were also formed. 
Dark, thick- 
Form C. 
Issue in coils through ostiolum. Hyaline. 
Ovate with a tendency to pointed ends. 
Non-septate. 
Very faintly biguttulate, except on Dox’s medium, where 
they were strongly biguttulate and the average size was 
larger. 
3 u-7'5 ux 2 u-3'5 uw (20 measurements). An Altervnaria form 
of spore was borne on the same mycelium, a large brown- 
coloured multi-septate spore of greatly varying shape and 
size. There were also numerous, thick-walled, dark coloured 
spore-like bodies averaging 8 « x 4 4 round the edges of the 
cultures; these were not observed to germinate or become 
detached from the mycelium and they were taken to be a 
kind of appressorium formed under cultural conditions. 
Form E. 
Issue in coils through ostiolum. Hyaline. 
Irregular, usually ovate to cylindrical, usually with rounded 
ends, but sometimes one end pointed, occasionally slightly 
curved. 
