Ascomycetes

The largest group of higher fungi (75% of all species) in which spores are produced in a sac (ascus). The asci may be borne on a cup-like structure (cup fungi, truffles) or within a flask-shaped structure (perithecium) that opens to the exterior through a small hole.

Basidiomycetes,
chalara die-back of ash,
chestnut blight,
Dutch elm disease,
fungi,
Kretzschmaria deusta,
massaria disease of plane,
powdery mildews,
scab

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
Read the preface. Order the book.

Previous term | Next term