Parapterulicium subarbusculum Corner, Ann. Bot., 16: 288 (1952)
Leal-Dutra, Caio A., Neves, Maria Alice, Griffith, Gareth W., Reck, Mateus A., Clasen, Lina A. & Dentinger, Bryn T. M., 2018, Reclassification of Parapterulicium Corner (Pterulaceae, Agaricales), contributions to Lachnocladiaceae and Peniophoraceae (Russulales) and introduction of Baltazaria gen. nov., MycoKeys 37, pp. 39-56: 40
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|Parapterulicium subarbusculum Corner, Ann. Bot., 16: 288 (1952)|
Basidiomes coralloid/filiform, up to 35 mm high, branched, erect, monoaxial with adventitious branches, yellow (10YR 8/6), solitary or gregarious. Stipe up to 13 × 0.3-0.7 mm, glabrous, concolorous with the rest of the basidiomes, attached to a small resupinate base up to 3 mm wide. Branches up to 1.3 × 0.2 mm, tapering upwards, rarely with branchlets.
Habitat: On dead twigs, petioles, leaves or seeds in the forest.
Hyphal system dimitic. Generative hyphae up to 7 μm wide thin-walled, without clamps. Skeletal hyphae 2-7 μm wide, thick-walled (up to 1.3 μm), rarely branched. Abundant dextrinoid dichophyses, up to 30 μm wide, slightly thick-walled (0.5-1 μm), branching with filiform ends, tips less than 0.5 μm wide.
Resupinate patch not well-developed in the studied material but with abundant dichophyses.
Basidia not observed.
Gloeocystidia up to 65 μm long, clavate to lanceolate/subulate, thin-walled, with numerous internal droplets, IKI-.
Basidiospores (12 –)13.4–16.8(– 17) × 3-3.5 μm (n = 19), hyaline, smooth, elongate, subfusiform, apex obtuse, base acute with small apiculus (0.3 μm), thin-walled and slightly amyloid, scarce in all the collected samples.
Brazil. Rio de Janeiro: Rio de Janeiro, Parque Nacional da Tijuca, close to Casa do Pesquisador, growing on the ground in rainforest litter, 24-25 Nov 2014, C.A. Leal-Dutra 108, 109, 117,118, 119, 120, 121, 122 (topotypes designated here: RB 639457, RB 639458, RB 639462, RB 639463, FLOR 56456, FLOR 56457, FLOR 56458, FLOR 0056459).
Brazil. Rio de Janeiro: Rio de Janeiro ( Corner 1952a, Type)
This species is recognised in the field by its characteristic resupinate disc at the base of the stipe (Fig. 2b, c). Corner (1952a) described P. subarbusculum from a single specimen collected in November 1948 on Corcovado in Rio de Janeiro and, based on its coralloid habit and dimitic hyphal system, placed the genus in Pterulaceae . The presence of gloeocystidia, slightly amyloid spores and dextrinoid dichophyses corroborates its placement in Russulales . It appears to be relatively common, though apparently overlooked.
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