Stromata flattened, with terminal clusters of globose fertile heads, each head 2-4 mm diam., with several perithecia per head, with long pubescent stipes, the stromata in total 4 cm high x 1 cm broad. Fertile heads dull black, interior white, stipes blackish brown. Surface of fertile heads wrinkled and tuberculate; perithecial ostiolar papillae discoid. Perithecia 0.5-1 mm diam. Asci 8-spored, cylindrical, long-stipitate, 200-250 µm total length x 7.5-8 µm broad, the spore-bearing parts 150-170 µm long. Apical ring of ascus J+, urn-shaped, 4.5 µm high x 3.7 µm broad. Ascospores brown, smooth, one-celled, ellipsoid-inequilateral, 20-23(25) x (6-)7-8 µm, with straight germ slit slightly less than spore length.

DISTRIBUTION: NORTH ISLAND: Wellington, known only from the type collection.

HABITAT: Decorticated wood.

Stromata complanata, fasciculis terminalibus capitulorum globosorum fertilium, omni capitulo 2-4 mm diametro, peritheciis aliquot per capitulum, stipitibus longis pubescentibus, tota 4 cm alta x 1 cm crassa. Capitula fertilia atra, intus alba, stipites atro-brunnei. Capitula fertilia rugosa tuberculata; papillae ostiolorum peritheciorum discoideae. Perithecia 0.5-1 mm diametro. Asci octospori, cylindrici, longe stipitati, 200-250 µm longitudine tota x 7.5-8 µm crassi, partibus sporiferis 150-170 µm longitudine. Asci annulus apicalis urniformis, 4.5 µm altus x 3.7 µm latus, in liquore Melzeri caeruleo-tinctus. Ascosporae brunneae, leves, unicellulares, ellipsoideo-inaequilaterales, 20-23 (-25) x (6-)7-8 µm, scissura germinativa recta quam spora breviore notata. Holotypus: PDD 39920.

NOTES: This species is characterised by having globoid fertile heads attached to a flattened stipe. Ascospore shape and stromal surface indicates that it is related to X. polymorpha.

HOLOTYPE: Wellington: locality and collector unknown, "no. 13", 22 Jul. 1916 (PDD 39920 ex Cleland collection).