Amauroderma ovisporum Gomes-Silva, Ryvarden & Gibertoni, 2015

Gomes-Silva, Allyne C., De Lima-Júnior, Nelson C., Malosso, Elaine, Ryvarden, Leif & Gibertoni, Tatiana B., 2015, Delimitation of taxa in Amauroderma (Ganodermataceae, Polyporales) based in morphology and molecular phylogeny of Brazilian specimens, Phytotaxa 227 (3), pp. 201-228 : 215-217

Amauroderma ovisporum Gomes-Silva, Ryvarden & Gibertoni , sp. nov., Fig. 8

MycoBank: MB 811030

Amauroderma ovisporum is characterized by the ovoid, large basidiospores.

Holotype:— BRAZIL. Rondônia: Porto Velho, Estação Ecológica de Cuniã , in soil, January 2007, A.C. Gomes-Silva 35 (Holotype URM 83240, isotype O).

Etymology: —ovi (Latin) = egg, spora (Latin) = spore, referring to the ovoid-shape of the basidiopores.

Basidiomata annual, solitary, laterally stipitate. Pileus single, semicircular, applanate to slightly infundibuliform, 3 cm wide, 2–4.5 cm high, 0.4–0.7 mm thick. Stipe cylindrical, lateral, solid to hollow, 8.5–10.5 cm long., 0.3–0.6 mm diam., brown (Cigar brown 16, Snuff brown 17), shiny to dull, glabrous, slightly rough, context of the stipe homogeneous or with two black lines and then hollow, fibrous, cream (B 2). Abhymenial surface shiny to dull, glabrous, concentrically zonate, radially zonate, dark brown to black (Fuscous black 36) when dry. Margin entire, acute, concolorous to the abhymenial surface. Hymenial surface brown to grey (Milky coffee 28, Smoke grey 34), poroid, pores angular, 4–6 per mm, dissepiments entire, thick. Context homogeneous or with two weak or strong black lines, up to 0.2 mm thick, cream (B 2). Tubes brown (Snuff Brown 17), 0.5 mm deep. Hyphal system dimitic; generative hyphae hyaline, clamped, thin-walled, 2–3 μm in diam.; skeletal hyphae yellow to brown, thick-walled to solid, arboriform, 3–4 μm in diam., IKI-. Hyphal pegs absent. Basidia not seen. Basidiospores obovoid, hyaline to yellow in KOH, thick-walled, finely ornamented, usually guttulate, 13–16 × 9–12 μm, slightly IKI+.

Substrate: —on soil.

Distribution: —only known form the the States of Pará and Rondônia in the Brazilian Amazonia.

Specimens examined: — BRAZIL. Pará: Melgaço, Estação Científica Ferreira Penna, February 2008, T.B. Gibertoni 262 (URM 83249). Rondônia: Porto Velho, Estação Ecológica de Cuniã, February 2008, A.C. Gomes-Silva et al. 405 (URM 83234), February 2011, A.C. Gomes-Silva et al. 2115 (URM 83241).

Remarks: — Amauroderma ovisporum is characterised by its dark basidiomata and by the large, ovoid basidiospores. Corner (1983) described several specimens and species with ovoid basidiospores. However, of those reported for the Neotropics, A.? rude A and A.? rude B have IKI-, ovoid to subglobose, smaller basidiospores varying from 8.5–12 × 7.5–10.5 μm. Of the Malaysian specimens and species, A. malesianum var. borneense Corner (1983: 75) has IKI-, ovoid to subglobose, wider basidiospores (14–15 × 13–14 μm), A. parasiticum Corner (1983: 79) has IKI-, ellipsoidovoid, longer basidiospores [16–19 × (10–) 11–12 (–13) μm] and smaller pores (10–12/mm), and A. subresinosum (Murrill) Corner (1983: 93) has IKI- basidiospores and sessile to subsessile basidiomata.

Amauroderma partitum (Berk.) Wakef. , Bulletin of Miscellaneous Informations of the Royal Botanical Gardens Kew 1934: 242 (1934), Fig. 9

≡ Polyporus partitus Berk. , Hooker’s Journal of Botany and Kew Garden Miscellany 8: 170 (1856).

Description:— Ryvarden (2004a), Gomes-Silva et al. (2010).

Substrate: —on dead deciduous wood or on soil.

Distribution: — Brazil, Colombia, Guyana and Venezuela.

Specimens examined: — BRAZIL. Amazonas: Tefé, Lago de Tefé, July 1973, E. Lleras et al. w/n (INPA 39838), Fonte Boa, Greci, November 1986, E.L.S. Silva 920 (INPA 155034). Paraíba: João Pessoa, Mata do Buraquinho, March 1985, V.L.F. Araújo w/n (JPB 6244), May 1985, V.L.F. Araújo w/n (JPB 6255), April 1986, V.L.F. Araújo w/n (JPB 6847, JPB 6859), May 1986, V.L.F. Araújo w/n (JPB 6848, JPB 6853, JPB 6854, JPB 8373), June 1986, V.L.F. Araújo w/n (JPB 6846), August 1986, V.L.F. Araújo w/n (JPB 6852, JPB 6851), October 1986, V.L.F. Araújo w/n (JPB 6855), April 1987, V.L.F. Araújo w/n (JPB 6856), June 1987, V.L.F. Araújo w/n (JPB 7256), August 1987, V.L.F. Araújo w/n (JPB 7257), September 1987, V.L.F. Araújo w/n (JPB 9241). Pernambuco: Recife, Parque Estadual Dois Irmãos, June 2008, J.M. Baltazar et al. JMB 333 ((URM 80059), J.M. Baltazar et al. JMB 328 (URM 80060), J.M. Baltazar et al. JMB 340 (URM 80061), J.M. Baltazar et al. JMB 350 (URM 80062), J.M. Baltazar et al. JMB 325 (URM 80063), July 2008, J.M. Baltazar et al. JMB 515 (URM 80064), January 2009, J.M. Baltazar et al. JMB 1337 (URM 80065). Rondônia: Porto Velho, Estação Ecológica de Cuniã, February 2007, A.C. Gomes-Silva 27 (URM 79460), February 2008, A.C. Gomes-Silva 399 (URM 79170), A.C. Gomes-Silva 404 (URM 79169), January 2010, A.C. Gomes-Silva et al. 976 (URM 83039), March 2010, A.C. Gomes-Silva et al. 884 (URM 82884), Parque Natural Municipal de Porto Velho, February 2007, A.C. Gomes-Silva 20 (URM 79459), February 2008, A.C. Gomes-Silva 277 (URM 79167), A.C. Gomes-Silva 292 (URM 79168), A.C. Gomes-Silva 313 (URM 79166), A.C. Gomes-Silva 336 (URM 79164), A.C. Gomes-Silva 337 (URM 79165), A.C. Gomes-Silva 447 (URM 79171), January 2009, A.C. Gomes-Silva 639 (URM 80050), A.C. Gomes-Silva 649 (URM 80051), A.C. Gomes-Silva et al. 675 (URM 83233), A.C. Gomes-Silva 704 (URM 80052), A.C. Gomes-Silva 678 (URM 80053), A.C. Gomes-Silva 700 (URM 80054), A.C. Gomes-Silva 679 (URM 80055), A.C. Gomes-Silva 666 (URM 80056), June 2009, A.C. Gomes-Silva et al. 724 (URM 81054), A.C. Gomes-Silva et al. 725 (URM 81055), A.C. Gomes-Silva et al. 726 (URM 81056), A.C. Gomes-Silva et al. 727 (URM 81057), March 2010, A.C. Gomes-Silva et al. 823 (URM 82882), January 2010, A.C. Gomes-Silva et al. 902 (URM 83040), February 2010, A.C. Gomes-Silva et al. 2019 (URM 83230), A.C. Gomes-Silva et al. 919 (URM 83231), February 2011, A.C. Gomes-Silva et al. 1055 (URM 83232), A.C. Gomes-Silva et al. 2023 (URM 83414). Roraima: Amaraji, Auaris, July 1974, G.T. Prance et al. w/n (INPA 45353, INPA 45476), Rio Uraricoeara, December 1973, G.T. Prance et al. w/n (INPA 43907).

Remarks: —This species is recognized by the vinaceous brown to brown abhymenial surface, the pale context, the hymenial surface with large pores (1–3/mm), and the ellipsoid to oblong basidiospores, 10–13 × 7–9.5(–10) μm.

Figures

FIGURE 8. Amauroderma ovisporum (URM 83240). A. Basidioma. B. Hymenial surface. C. Basidiospores in KOH. D. Basidiospores in SEM. Scale: A, B = 1 cm; C = 5 μm; D = 2 μm. Photos:A.C. Gomes-Silva.

FIGURE 9. Amauroderma partitum. A (URM 83233), C (URM 82882), D (URM 82884). Basidiomata. B (URM 83233), E (URM 82882). Hymenial surface. F. Pores with hyphal pegs (URM 82884). Scale: A = 1 cm; B, E, F = 1 mm; C = 0.5 cm; D = 0.25 cm. Photos: R.F.R. Melo.