The Penicillium strains 414T, 415 and 416 displayed identical
colony and microscopic morphologies. On the basis of
their micro- and macromorphological features, these three
Penicillium isolates appeared to be most closely related to P.
raistrickii G. Smith. The similarities we observed included: a
velvety, or nearly velvety, colony surface on CYA that was
radiately sulcate, with white floccose aerial hyphae; roughened
conidiophore walls; the presence of bi- and terverticillate
penicilli; spheroidal conidia with smooth, or nearly
smooth, walls; well-developed globose to subglobose sclerotia.
Other morphological characteristics were, however,
distinguishable. The most noticeable differences between
these three Penicillium isolates and P. raistrickii were: on
CYA, a colony surface that was radiately sulcate with few
furrows and reversed colouring (fromlight yellow to brown);
the presence of light brown exudates; on MEA, the presence
of the centre overlaid with sectors of shallow radiating
white sterile hyphae; penicilli that were often terverticillate,
yielding conidiophores that were less rugose with shorter
stipes, metulae and phialides and with bigger conidia.