Specimens identified by Barbara Paulus as Aleurodiscus parmulariformis (red in the attached tree) are sister to A. mirabilis sensu Wu et al. (2011, 2010), and hence phylogentically distinct from Aleurodiscus sensu stricto (type species A. amorphus, blue in the attached tree). The attached phylogeny is based on LSU sequences from PDD 89138 incorporated into the alignment from Wu et al. (2001).

Beilschmiedia tawa (A. Cunn.) Hook. f. & Benth. Auckland: Earthquake Flat, Rotorua, 1,500ft, June, 1952, G.H.C. Coprosma foetidissima Forst. Otago: Horseshoe Bay, Stewart Island, February, 1954, J.M. Dingley. Fuchsia excorticata L.f. Taranaki: Mt. Egmont, 4,000ft, April, 1946; J.M. Dingley. Hedycarya arborea Forst. Auckland: Mt. Pirongia, 2,000ft, May, 1947, G.H.C. Leptospermum ericoides A. Rich. Wellington: Oturere River, Mt. Tongariro, 4,000ft, December, 1946, G.H.C. Nothofagus fusca (Hook. f.) Oerst. Westland. Staircase Creek, Reefton, 2,000ft, December, 1952, S.D. Baker. Nothopanax colensoi (Hook. f.) Seem. Taranaki: Mt. Egmont, 3,000ft, March, 1951, J.M. Dingley; Mt. Egmont, 4,000ft, February, 1952, G.H.C. Wellington: Whakapapa Valley, Mt. Ruapehu, 3,000ft, October; 1949, J.M. Dingley. Nothopanax simplex (Forst. f.) Seem. Otago: Bullerfields Bay, Stewart Island, February, 1954, J.M. Dingley. Olearia colensoi Hook. f. Taranaki: Mt. Egmont, 4,000ft, August, 1955, G.H.C. Pittosporum tenuifolium Banks & Sol. Auckland: Earthquake Flat. Rotorua, 1,500ft, June, 1952, G.H.C. Phyllocladus trichomanoides Don. Wellington: Mt. Tongariro, 2,500ft, March, 1952, G.H.C. Pseudowintera colorata (Raoul) Dandy. Auckland: Upper Mohaka River, Kaimanawas, 2,000ft. May, 1953, J.M. Dingley. Quintinia serrata A. Cunn. Westland: Weheka, 700ft, November, 1954, J.M. Dingley; Pukekura, November, 1954, J.M. Dingley; Harihari, November, 1954, J.M. Dingley. Rhipogonum scandens Forst. Auckland: Earthquake Flat, Rotorua, 1,500ft, June, 1952, G.H.C. Suttonia salicina Hook. f. Auckland: Te Moehau, Coromandel Peninsula, 2,500 ft., December, 1946, J.M. Dingley; Hauhaungaroa Range, 2,800ft, March, 1953; J.M. Dingley. Weinmannia raccmosa L.f. Auckland: Mamaku Forest, 1,800ft, September, 1954, G.H.C., type collection, P.D.D. harbarium, No. 15218. Wellington: Ohakune Track, Mt. Ruapehu, 2,500ft, December, 1953, J.M. Dingley. Westland: Orwell Creek, Ahaura, April, 1955, J.M. Dingley.

Hymenophore annual, membranous, scutellate, consisting of numerous orbicular colonies 2-10 mm diameter, coalescing to form irregular linear areas to 6 cm long; margins in young specimens upturned slightly, tan, hirsute, becoming plane, definite, white, arachnoid; hymenial surface ivory-white, or cream, remaining so or becoming ochre, buff with reddish tints, olive-brown or dingy-brown, finally deeply areolately creviced, segments separating widely. Context white, to 0.5 mm thick, basal layer of mainly. parallel hyphae radiately arranged, crystals embedded between the basal layer and subhymenium; generative hyphae 4-6 µ diameter, walls 1-1.5 µ thick, hyaline, freely branched, septate, without clamp connexions. Hymenial layer to 100 µ deep, a dense palisade of basidia, paraphyses, pseudophyses and gloeocysticlia. Basidia subclavate, 65-85 x 12-16 µ, 4-spored; sterigmata slightly arcuate, subulate, to 12 µ long. Paraphyses subclavate, to 60 x 9 µ. Pseudophyses cylindrical, slightly projecting, near the surface often bent or angled, apices acuminate or rounded, sometimes forked. Gloeocystidia scanty or abundant in different collections, arising in the base of the subhymenium, flexuous-cylindrical, 80-160 x 6-16 µ, apices rounded. Spores broadly elliptical, oval or obovate, obliquely apiculate, 12-16 x 8-10 µ, walls smooth, hyaline, 0.25 µ thick, amyloid.

DISTRIBUTION. New Zealand.

HABITAT. Adnate on bark of dead branches.

Hymenophorum membranaceum, orbiculatum, scutellatum, angusta basi adjunctum, marginibus liberis et planis, 2-10 mm diam., inaequaliter coalescens ad 6 cm longum; superficies hymenii eburnea deinde cremea, ochracea vel bubalina, demum alte areolate rimosa. Contextus albus, ad 0.5 mm crassus; hyphae generatoriae 4-6 µ diam., hyalinae, enodulosae, parietibus 1-1.5 µ crassis. Basidia subclavata, 65-85 x 12-16 µ. Pseudophyses cylindricales, ad 6 µ diam., saepe geniculati. Gloeocystidia flexuoso-cylindricalia. 80-160 x 6-16 µ. Sporae late ellipticae, ovales vel obovatae, oblique apiculatae, 12-16 x 8-10 µ, parietibus levibus, 0.25 µ crassis, amyloidibus.

Separated from other species in this section by the scutellate pilei which are usually plane with the surface of the substratum, and often attached throughout their breadth. The hymenial surface may be white (as in the type), buff, or olivaceous, and the context is soft and readily sectioned. Colonies soon merge to form irregular areas, which may extend to 6 cm. In most collections the surface is scantily creviced; in two they are creviced so deeply that the white basal layer is exposed, and segments separated by 0.5-1 mm. Gloeocystidia usually form a palisade in the hymenial layer and are also scattered in the context. In one series they are abundant and attain a diameter of 16 µ; in a second they are scanty and do not exceed a diameter of 9 µ. Masses of crystals are usually embedded at the. base of the hymenial layer.

Weinmannia raccmosa L.f. Auckland: Mamaku Forest, 1,800ft, September, 1954, G.H.C., type collection, P.D.D. harbarium, No. 15218.