K(M)153678, Taylor 51. The collections consists of 3 fruitbodies. Petersen & Hughes in their revision regionally recognise O. apalosarca (syn O. australis), O. canarii (tropics and olive capped) and O. exanullata (E. Australia and big). The Types originate from: O. apalosarca - Sri Lanka, O. canarii - Indonesia, O. exanullata - Eastern Australia, O. australis - New Zealand. In their phylogeny they have a single O. australis/apalosarca clade (all NZ material) and two unamed clades (1&2) of American 'O. canarii/cubensis' not discussed further. Morphologically they separate apalosarca from canarii & exannulata by the presence of a polycystoderm in the former and a trichoderm in the latter. An examination of multiple sections from two of the caps of this type indicates difficulty in recognising the distinction. It is not a 'hymeniderm becoming a polycystoderm' and does not have 'keg-shaped cells'. Some of the inflated cylindrical elements do correspond to the Petersen plate, but are at odds with the text. In addition more recently available sequence data has replaced the single 'apalosarca' clade with one from Sri Lanka labelled canarii, a taxon from Au/PNG labelled australis and the NZ clade, also labelled australis. From these data it seems most likley that the name O. apalosarca cannot be applied to all Australasian material and remains unfixed, the correct name for the Au/PNG material requires clarification, and the correct name for the NZ taxon is O. australis. Good/clear morphological separators between these species clearly require more work, or at least a better definition of what to look for. It also seems possible that O. exanullata is a phenotyic variant of O. australis.

[Notes from Kew Type specimen, PRJ 2010] Segedin notes - Stevenson & Taylor, Kew Bulletin 19: 33, 1964. Typo - plate 4/5 is wrong, should be plate 4/4

Pileus 3-5.5 cm diam., white becoming dingy fawn, convex splitting at margins, cuticle splitting irregularly and revealing firm white flesh. Gills adnate, powdery white, moderately distant, long and short intercalated, very deep with ribs at base. Stipe 2.5 x 0.6-1 cm, excentric, white above, fawn at swollen base; flesh solid, white, silky. Spores 24 x 21 µm, non-amyloid, moderately thick-walled (Fig. 13); print white.

On fallen rotting log in open near forest, Wainui Valley, Wellington, 25.3.1961, G. M. Taylor (type).

Pileus 3-5.5 cm diam., albus, deinde sordide fulvus, convexus, marginibus fissis, cuticula irregulariter fissa carnem firmam albam nudante. Lamellae adnatae, pulvereo-albae, modice distantes, longiores cum brevioribus intercalatae, altissimae, basi costatae. Stipes 2.5 x 0.6-1 cm, excentricus, superne albus, basi tumida hinnuleus; carne solida, alba, sericea. Sporae 24 x 21 µm, haud amyloideae, parietibus modice crassis, in curnulo albae.

Typus: G. M. Taylor 51.