Abstract
Hyphae of Hypoxylon fuscum invade alder wood and attack all cell types. Eventually, hyphae emerge into the bark, rupture the periderm, and form a stroma. Coiled ascogonia are produced in the stroma. Each ascogonium becomes ensheathed in a hyphal envelope which ultimately develops into the ascocarp wall. The ascogonium becomes segmented, falling apart into cells. Some ascogonial cells produce ascogenous cells; others become inflated and branched. Polar growth of the envelope and filamentous space-making hyphae are involved in perithecial expansion. Developing asci grow into the mass of space-making hyphae and lyse some of it. The developmental patternis of the Xylaria type.
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