On dead bark of (1) Corynocarpus laevigatus, Auckland, Tomorata, Mar 1965, S. Davison, 24345; (2) Dysoxylon spectabile, Titirangi, Mar 1966, R.F.R. McN., 24997; (3) Hibiscus sinensis, Meadowbank, Apr 1966, J. M. Dingley, 25105; (4) unknown host, Waitakere Dam, Feb 1966, R.F.R. McN., 24998.

Fructifications gelatinous, originating as pustules, becoming convoluted or cerebriform, coalescing to form irregular areas to 10 cm in longest dimension, at first hyaline when fresh, becoming vinaceous brown, drying to a vernicose film; white, seed-like, calcareous concretions embedded in fructifications, conspicuous when dry. In section to 2 mm thick, consisting of thin-walled, hyaline, distinct hyphae, often with bulbous septa, clamp connections present. Hymenium composed of dikaryophyses and basidia; dikaryophyses irregularly branched, slender; probasidia sphaero-pedunculate, with long, cylindrical stalks and basal clamp connections, inflated portion depressed-obovate, 9-12.5-(14) x 8-9.5-(11) µm, becoming longitudinally cruciate-septate; metabasidia separated from stalks by basal septa; sterigmata cylindrical, to 45 µm long. Basidiospores cylindrical, curved-cylindrical or allantoid, hyaline, apiculate, 10-13.5-(17.5) x 4-5.8 µm Germination by repetition.

Angiosperm bark and wood.

Coker, J. Elisha Mitchell scient. Soc. 35: pl. 23, f. 3, 4. pl. 41, f. 1. pl. 56, f. 3-5. 1920; Wells, Am. J. Bot. 51: 361, f. 1. 1964.

Exidia nucleata was first recorded from New Zealand as Naematelia nucleata by Colenso (1886, p. 306) and later by Massee (1906, p. 43), but no collection data were given. As noted previously (McNabb. 1964, p. 411), two collections at Kew which macroscopically resemble Exidia nucleata are both Pleurocolla compressa (Ellis & Everh.) Diehl.
Embedded, seed-like concretions are not a constant characteristic of this species, but when present are a conspicuous feature of dried fructifications. The development of the sphaeropedunculate basidia has been comprehensively described by Wells (1964).

North Carolina, U.S.A.