Nodulisporium umbrinum

Parasitic fungus on Hypoxylon species (formerly known as Isaria umbrina), growing on old stromata of Hypoxylon fragiforme or H. howeanum, appearing velutinous and pulverulent, developing slender coralloid structures, pale brown with pinkish tints when fresh, turning dingy greyish-brown when dry.

Conidiophores irregularly branched, 2.5–4 µm wide, with abundant brown intracellular pigment in the basal region.

Conidiogenous cells minutely verruculose, hyaline or containing faint pale brown intracellular pigment, 2–3.5 µm wide.

Conidia ovoid to shortly ellipsoidal, slightly pointed at the attachment scar, thin-walled, smooth or very delicately verruculose, measuring 4–5.5 µm long by 2.5–3.5 µm wide, with faint brownish-grey intracellular pigment.

Herbarium material available: JTP2186/24.