Coriaria arborea Kirk. Auckland: Te Puna, coast, May, 1948, M. Hodgkins. Leptospermum ericoides A. Rich. Auckland: Te Moehau, Coromandel Peninsula, 300ft, October, 1954, J.M. Dingley. Wellington: Waikato River, Kaimanawas, 2,800ft, March, 1952, G.H.C.; Oturere River, Mt. Tongariro, 3,500ft, January 1931, G.H.C. Leptospermum scoparium Forst. Auckland: Mt. Te Aroha, 1,100ft, December, 1953, G.H.C., type collection, P.D.D. herbarium, No. 15238; Huia, 200ft, January, 1954, E.E. Chamberlain.

Hymenophore annual, resupinate, adnate, ceraceous-cretaceous, at first appearing as small linear scattered colonies 2-5 x 1-2 mm, becoming coalesced forming linear effused areas to 5 cm long; hymenial surface white, remaining so or becoming cream, or occasionally sulphur yellow, pruinose, at length deeply areolately creviced; margin thinning out, fibrillose, white, adnate. Context white, 120-160 µ thick, basal layer narrow, of mainly parallel hyphae, intermediate layer occupying the greater part of the context, of closely arranged upright hyphae soon cemented by their walls to form a pseudoparenchyma, embedding masses of crystals; generative hyphae to 6 µ diameter, walls l µ thick, hyaline, branched, septate, without clamp connexions. Hymenial layer to 50 µ deep, a loose palisade of basidia, paraphyses, acanthophyses and gloeocystidia. Basidia subclavate, 16-25 x 5-6 µ, 4-spored; sterigmata slender, upright, to 6 µ long. Paraphyses subclavate, scanty, narrower and shorter than the basidia. Acanthophyses forming the bulk of the hymenial layer, clavate or fusiform, to 6lU diameter, with the apical region covered with several (5-14) blunt spines 2-3 µ long. Gloeocystidia arising in the base of the context and subhymenium, some projecting slightly, fusiform or flexuous-cylindrical, 45-80 x 8-10 µ, apices rounded, walls 0.25 µ thick. Spores elliptic-oblong with rounded ends, apiculate, 7-9 x 4-5 µ, walls smooth, hyaline, 0.2 µ thick, amyloid; often adhering in fours.

DISTRIBUTION. New Zealand.

HABITAT. Effused on bark of dead stems and branches.

Hymenophorum ceraceo-cretaceum, primo lineare, 2-5 x 1-2 mm, resupinatum, coalescens ad 5 cm longum; superficies hymenii alba, pruinosa, demum alte areolatae rimosa. Contextus albus, 120-160 µ crassus; hyphae generatoriae ad 6 µ diam., hyalinae, enodulosae, parietibus 1 µ crassis. Basidia subclavata, 16-25 x 5-6 µ. Acanthophyses clavati, ad 6 µ diam., in apice 5-14 digitalis processis. Gloeocystidia flexuouo-cylindricalia, 45-80 x 8-10 µ. Sporae elliptico-oblongae, apicibus rotundis, apiculatae, 7-9 x 4-5 µ, parietibus levibus, 0.2 µ crassis, amyloidibus.

Separated from other species present in this region by the clavate acanthophyses, abundant gloeocystidia, small basidia, elliptical smooth spores and effused resupinate hymenophore with a well developed intermediate layer. Arrangement of the context is similar to that of most species of Corticium, and the small basidia and spores strengthen the resemblance. As acanthophyses are present, and spores amyloid, the species has been treated as an Aleurodiscus. Because of its unusual morphology for a member of this genus the specific name has been given.
The species resembles A. cerussatus (Bres.) Hoehn. & Litsch. in surface features, presence of apically spined acanthophyses, gloeocystidia and smooth elliptical spores. It differs in that basidia are smaller, clamp connexions absent, and spores are smaller and of different shape. In most collections the hymenial surface is white, and remains so or changes to cream on drying; the collection from Coriaria is rich cream with sulphur yellow areas where growing in bark crevices. It is identical in microfeatures.
This and the following species [Aleurodiscus sparsus] are resupinate and effused, with the context composed of both basal and intermediate tissues. A. candidus, though colonies are usually pulvinate, is treated under the resupinate section since it possesses a similar type of context and colonies are sometimes coalesced and form resupinate areas. Species may be divided into four sections according to the types of acanthophyses and dendrophyses. Acanthophyses of A. aberrans are clavate with apices crowned with digitate processes or spines, coralloid in A. coralloides, A. coronatus and A. sparsus, and botryose in A. botryosus. Dendrophyses of somewhat simple type are present in A. acerinus, A. candidus, A. nivosus and A. aurantius.

Leptospermum scoparium Forst. Auckland: Mt. Te Aroha, 1,100ft, December, 1953, G.H.C., type collection, P.D.D. herbarium, No. 15238

CONIFERAE. Pinus radiata: Nelson, Appleby, 30 m. CORIARIACEAE. Coriaria arborea: Auckland, Te Puna, coast. MYRTACEAE. Leptospermum ericoides: Auckland, Te Moehau, Coromandel Peninsula, 250 m. Wellington, Oturere River, Mt. Tongariro, 1,200 m. Leptospermum scoparium: Auckland, Mt. Te Aroha, 400 m, type collection, P.D.D. herbarium, No. 15238; Monument, Huia, 70 m. Wellington, Kaimanawa Ranges, 800-1,200 m.

Hymenophore annual, adherent, ceraceous-cretaceous, at first appearing as small linear scattered colonies 2-5 x 1-2 cm, becoming coalesced forming linear effused areas to 5 cm long; hymenial surface white, remaining so or becoming cream, or occasionally sulphur-yellow, at length deeply areolately creviced; margin thinning out, fibrillose, white, adherent. Context white, 120-160 µ thick, basal layer narrow, of mainly parallel hyphae, intermediate layer occupying the greater part of the context, of closely arranged erect hyphae soon cemented by their walls to form a pseudoparenchyma, embedding masses of crystals; generative hyphae forming the bulk of the hymenial layer, clavate or fusiform, to 6 µ, diameter, with the apical region covered with several (5-14) blunt processes 2-3 µ long. Gloeocystidia arising in the base of the context and subhymenium, some projecting slightly, fusiform or flexuous-cylindrical, 45-80 x 8-10 µ, apices rounded. Hymenial layer to 50 µ deep, a loose palisade of basidia, paraphyses, acanthophyses, and gloeocystidia. Basidia subclavate, 16-25 x 5-6 µ, bearing 4 spores; sterigmata slender, erect, to 6 µ long. Paraphyses subclavate, scanty, 12-18 x 4-5 µ. Spores elliptic-oblong with rounded ends, apiculate, 7-9 x 4-5 µ, walls smooth, hyaline, 0.2 µ thick, amyloid, often adhering in fours.

DISTRIBUTION: New Zealand.

HABITAT: Effused on bark of dead stems and branches.

Separated from other species bearing clavate acanthophyses by the small basidia, smooth elliptic oblong spores, and absence of clamp connections. The species resembles `Aleurodiscus' cerussatus (Bres.) H. & L. in surface features, presence of gloeocystidia, apically spined acanthophyses and smooth elliptical spores. It differs in that basidia are smaller, clamp connections absent, and spores are smaller and of different shape. In most collections the hymenial surface is white and remains so or changes to cream on drying; the collection from Coriaria arborea is rich cream with sulphur yellow areas where growing in bark crevices.

TYPE LOCALITY: Mt. Te Aroha, Auckland, New Zealand.

CONIFERAE. Pinus radiata: Nelson, Appleby, 30 m. CORIARIACEAE. Coriaria arborea: Auckland, Te Puna, coast. MYRTACEAE. Leptospermum ericoides: Auckland, Te Moehau, Coromandel Peninsula, 250 m. Wellington, Oturere River, Mt. Tongariro, 1,200 m. Leptospermum scoparium: Auckland, Mt. Te Aroha, 400 m, type collection, P.D.D. herbarium, No. 15238; Monument, Huia, 70 m. Wellington, Kaimanawa Ranges, 800-1,200 m.

Hymenophore annual, adherent, ceraceous-cretaceous, at first appearing as small linear scattered colonies 2-5 x 1-2 cm, becoming coalesced forming linear effused areas to 5 cm long; hymenial surface white, remaining so or becoming cream, or occasionally sulphur-yellow, at length deeply areolately creviced; margin thinning out, fibrillose, white, adherent. Context white, 120-160 µ thick, basal layer narrow, of mainly parallel hyphae, intermediate layer occupying the greater part of the context, of closely arranged erect hyphae soon cemented by their walls to form a pseudoparenchyma, embedding masses of crystals; generative hyphae forming the bulk of the hymenial layer, clavate or fusiform, to 6 µ, diameter, with the apical region covered with several (5-14) blunt processes 2-3 µ long. Gloeocystidia arising in the base of the context and subhymenium, some projecting slightly, fusiform or flexuous-cylindrical, 45-80 x 8-10 µ, apices rounded. Hymenial layer to 50 µ deep, a loose palisade of basidia, paraphyses, acanthophyses, and gloeocystidia. Basidia subclavate, 16-25 x 5-6 µ, bearing 4 spores; sterigmata slender, erect, to 6 µ long. Paraphyses subclavate, scanty, 12-18 x 4-5 µ. Spores elliptic-oblong with rounded ends, apiculate, 7-9 x 4-5 µ, walls smooth, hyaline, 0.2 µ thick, amyloid, often adhering in fours.

TYPE LOCALITY: Mt. Te Aroha, Auckland, New Zealand.
DISTRIBUTION: New Zealand.

HABITAT: Effused on bark of dead stems and branches.

Separated from other species bearing clavate acanthophyses by the small basidia, smooth elliptic oblong spores, and absence of clamp connections. The species resembles `Aleurodiscus' cerussatus (Bres.) H. & L. in surface features, presence of gloeocystidia, apically spined acanthophyses and smooth elliptical spores. It differs in that basidia are smaller, clamp connections absent, and spores are smaller and of different shape. In most collections the hymenial surface is white and remains so or changes to cream on drying; the collection from Coriaria arborea is rich cream with sulphur yellow areas where growing in bark crevices.