Xylaria carpophila

Morphological Features:

Carpophore composed of fruiting bodies in the form of thin, filiform, and erect stromata that can exceed 5 cm in height but are extremely slender, measuring barely 1 mm in width. They are often simple, though bifurcate specimens may also be encountered. Dark gray or more typically black in color, with a flattened apex and a lower region that is consistently black. This basal portion does not constitute a stipe in the strict sense, but it is differentiated from the remainder of the structure by being covered with very fine hairs, particularly near the point of attachment to the substrate. As is typical for many Ascomycota, this species exhibits a conidial state, usually observed during spring but not excluded in other seasons. Macroscopic differentiation of this form relies on the presence of a whitish pruina covering the carpophores, imparting a powdery appearance.

Hymenium smooth and concolorous, embedded within the surface of the carpophore.

Flesh practically nonexistent and odorless.

Habitat:

This represents a distinguishing characteristic of the species in question, as it fruits on beech nuts (commonly known as beechnuts), where it frequently occurs in clusters. It is relatively common during the colder months of autumn and even into winter in its primary form, whereas the conidial state is more typical of spring. Due to its diminutive size, locating specimens can be challenging despite the species being frequent.

Observations:

A curious species due to its specific habitat on beechnuts, its predominantly black coloration, and its extreme slenderness. Very similar, and even smaller and more slender, is Xylaria filiformis, which fruits on various herbaceous remains and is less frequently encountered than the species described here. Another similar species is Xylaria hypoxylon, which is more robust and features a clearly bifurcate apex resembling a deer antler.