Terminology used in this Atlas is explained below. The reader is also referred to the Dictionary of the Fungi (Hawksworth et al., 1995). For descriptive terms in morphology, the Illustrated Dictionary of Mycology (Ulloa & Hanlin, 2000) is recommended. Diagram of used shape terminology

A – B – C – D – E – F – G – H – I – K – L – M – N – O – P – R – S – T – U – V – W Y Z

Glossary – O

obclavate – cylindrical and widened towards the base.

oblate – circular in face view and broadly ellipsoidal in lateral view.

obligatory pathogen – having invasion of the mammal body as sole strategy, and thus being transmitted directly from one mammal host to the other.

oblique – septate at sharp angles to length axis of hypha.

obovoidal – inverted eggshaped, with narrow end down.

obpyriform – inverted pearshaped, with narrow end down.

obtuse – with rounded ends.

oidia – plural of oidium, thin-walled, swollen resting cell in Mucorales.

oidium (plural: oidia) – thin-walled, swollen resting cell in Mucorales.

oogonia – plural of oogonium, female sex organ of Oomycota.

oogonium (plural: oogonia) – female sex organ of Oomycota.

opaque – vaguely transparent or nontransparent.

opportunist – fungus having its niche outside the mammal body, but, when inoculated coincidentally into an immunocompromised host, being able to cause systemic infection.

orthotropic – at right angles.

ossiform – boneshaped, short cylindrical with swollen ends.

osteomyelitis – pyogenic infection of the bone and bonemarrow.

ostiolum – preformed pore by which spores are freed from a fruit body.

ovoidal – eggshaped with narrow end up.