ADDITIONAL SPECIMENS EXAMINED: NORTHLAND: Waipoua, on Agathis australis, M. E. Lancaster, Dec 1951, PDD 10983. AUCKLAND: Clevedon, on dead wood, J. M. Dingley, Aug 1949, PDD 7755. STEWART ISLAND: Ulva Inlet, on Dacrydium cupressinum, J. M. Dingley, Feb 1954, PDD 13456; vic. Halfmoon Bay, Garden Mound Scenic Reserve, P. K Buchanan 85/219, R. Block, 23 Apr 1985, PDD 53440; Paterson Inlet, Charity I., on Weinmannia racemosa, P. K. Buchanan 85/235, R. Block, 24 Apr 1985, PDD 53835.

BASIDIOCARPS annual, resupinate, to 8 x 10 cm, to 2.5 mm thick; pore surface cream to pale yellow-brown (73.p.OY); margin white, thinning out and in places extended into white branched rhizomorphs; rhizomorphs also developing from context and then ramifying under bark of host, to 0.5 mm diam.; pores angular, sometimes with velutinate mouths, mostly 2-5 per mm but in places much wider, to 2 mm across especially when developing on near-vertical surfaces; tubes to 2 mm long, concolorous with pores; context white, narrow, of loose composition. HYPHAL SYSTEM monomitic; generative hyphae hyaline, clamped, IKI-, non-metachromatic in cresyl blue, non-cyanophilous, 2.5-4 µm diam., rarely with portions inflated to 8 µm, with wall thin or thickened to 0.5 µm, with encrusting crystalline material, en crustation sometimes particularly dense on hyphae of the rhizomorphs and in some specimens present on all hyphae except those of the subhymenium and hymenium. CYSTIDIAL ELEMENTS arising directly at right angles from generative hyphae and subtended at base by a clamp, consisting of a thin-walled clavate structure with apex inflated, resembling immature basidia, e.g., 14-21 x 6.5-10.5 µm, supporting a refractive, globose to subglobose head of dense resinous or wax-like material 9-15 µm diam. apparently enclosed within a membrane, in most specimens abundant on hyphae in context and also present, though smaller and less well developed, on hyphae in trama and in rhizomorphs; supporting cell sometimes lacking a resinous head, possibly representing an immature stage. BASIDIA broadly clavate to ellipsoid, 4-sterigmate, basally clamped, 12.5-18 x 6-8 µm. BASIDIOSPORES subglobose, hyaline, smooth- and thin-walled, IKI-, with prominent apiculus, 4-5(-6) x 3.5-4.3 µm. WOOD ROT brown.

Northland, Auckland, Stewart Island.

SUBSTRATA: Known from dead wood of Agathis australis, Dacrydium cupressinum, and Weinmannia racemosa.

Basidiomata resupinata, pori fascies cremea ad pallide brunneus, pori 2-5 per mm, tubi concolorous, contextus albus, systema hypharum monomiticum, hyphae generatoriae fibulatae, 2.5-4 µm latae, cystidia clavatae, tenuitunicatae, capitatae, basidia clavatae 12.5-18 x 6-8 µm, 4 sterigmatibus, basidiosporae subglobosae, hyalinae, tenuitunicatae, 4-5 x 3.5-4.3 µm. Cariem brunneam in ligno producit.

ETYMOLOGY: globicystidia, referring to the globose to subglobose head of cystidial elements arising from generative hyphae.
NOTES: Cunningham (1965) included specimens of this species among material which he identified as Poria albolutescens (= Anomoporia albolutescens (Romell) Pouzar). Postia globicystidia shares several features with A. albolutescens including small ellipsoid spores, crystal-encrusted hyphae, and a brown rot (Ryvarden & Gilbertson 1993), but differs in having inamyloid spores, white rather than distinctly yellow rhizomorphs, and resinous cystidial elements. Cunningham's concept of A. albolutescens is based on discordant elements. Among his cited material we have also identified the white rot species Ceriporiopsis myceliosa (Peck) Ryvarden & Gilb. and a species of Antrodia P.Karst. or Diplomitoporus.
The cystidial elements (Fig. 1D, 2B) are a conspicuous feature of recent collections (e.g., PDD 53835, 53440, 66386) but are rare in older material (e.g., PDD 7755, 10983, 13456). They are most readily seen in the context, but also may occur in the trama and on hyphae of rhizomorphs. The nature of the apical resinous material is unknown, but it appears to be wax-like in KOH (and may crack when mounted under pressure), resinous in lactophenol, and dissolves or dissipates in Melzers' reagent, leaving behind an empty sphere bounded by an apparent membrane. The overall structure superficially resembles a stephanocyst, though lacking the characteristic frill of teeth at the apex of the supporting cell. In form it is similar to resinous cystidial elements described for species of Hvphoderma Wallr. (Eriksson & Ryvarden 1975, pp. 502, 510). Heavy encrustation of hyphae (Fig. 2C) in collections such as PDD 13456 may obscure these elements. Crystalline encrustation on hyphae is insoluble in KOH and Melzers' reagent.

HOLOTYPUS: New Zealand, Northland, Trounson Kauri Park, on Agathis australis, P. K. Buchanan 95/ 115, L. Ryvarden, 10 Apr 1995 (PDD 66386).