194 
brought to Kew and kept out of doors under fairly natural 
conditions. When examined in spring no ascigerous stage had 
appeared nor has any British botanist, as far as we know, 
succeeded in finding perithecia. 
When pruning roses this spring patches of discoloured tissue 
were noticed on the young wood of the previous season, appar- 
tain abundant mycelium and compact masses of fungus-tissue 
bearing spores of Actinonema rosae. 
Description of infected wood.—The infected areas present 
a blackened, blistered appearance dotted with pustules (Plate VI), 
the fungus forming a stromatic cushion or pad below the cuticle 
(Figs. i & Il). The mycelium itself is colourless, and was, a: 
ar as the material showed, confined to the cortex, where it 
ae) 
754 uf] & ° 
ee No 
ese oe 
e . 
Text fig. 1—Section through the cortex of a one-year old shoot showing 
young acervulus with conidiophores and spores. X 200. 
aN of 1 2 og fl fy 
EPI Ba (Ll h 
S44 IM MA 
WB Gace 
r 
Up ay 
as 
Po 
Ons 
Text fig. 2—Section throu 
shoot showing com 
spores in spring. 
gh dormant cushion on a one-year old rose 
age Aaa, tissue commencing to give rise to 
x 200. 
