Fomitiporia calkinsii (Murrill) Vlasák & Kout.

da Silva, Maria Aparecida, de Jesus, Maria Aparecida, Peres, Rafaela Saraiva & Sales-Campos, Ceci, 2021, Notes on Fomitiporia Murrill in Amazon region: a list of species and new records, Check List 17 (2), pp. 323-331 : 325-327

Fomitiporia calkinsii (Murrill) Vlasák & Kout.

Material examined. BRAZIL – Amazonas • Manaus, Adolph Ducke Forest Reserve ; 03°00′27″S, 059°53′ 59°59′W, 92 m alt.; 28.IV.2017; M.A. Silva leg.; INPA 286221 .

Identification. Vlasák and Kout (2011) described F. calkinsii as follows: basidiome perennial, flattened ( Fig. 2B), surface hymenophoral with circular pores 6–8 per mm ( Fig. 2B); context zoned, reddish-brown ( Fig. 2B); hyphal system dimitic, with generative hyphae hyaline, thin-walled, septate ( Fig.4 B); skeletal hyphae yellowish, thick-walled, nonseptate ( Fig. 4B); basidiospores

dextrinoid, subglobose, hyaline, thick-walled, 5–6.5 × 5–6 μm ( Fig. 4B).

Remarks.. Fomitiporia calkinsii is morphologically and physiologically very close to F. apiahyna and F. castilloi Decock & Amalfi ( Amalfi and Decock 2013). However, some characteristics distinguish them. In F. castilloi arrows and black lines are present on the hymenial surface, while in F. apiahyna has smaller basidiospores (5–6 × 4–5 µm vs. 5–6.5 × 5–6 μm in F. calkinsii ) ( Ryvarden 2004; Decock and Amalfi 2013). Our specimen has 5–6 pores per mm, while Amalfi and Decock (2013) re- ported 7–8 pores per mm, Vlasák and Kout (2011) reported 6–8 pores per mm. The context in our specimen presents some discontinuous black lines, as noted by Vlasák and Kout (2011), which corroborates the identifi- cation of our material. Recent studies show that this species has a geographical distribution restricted to Mexico and the USA (Decock and Amalfi 2013). The morpholog- ical characteristics of our samples are consistent with F. calkinsii ; however, the molecular study by Decock and Amalfi (2013) has shown that F. calkinsii does not belong to the Neotropical species clade, which is crucial, as biogeography is an important criterion of classifica- tion ( Alves-Silva et al. 2020a). Therefore, a more indepth study, including molecular data, might show that our sample actually represents a new species.

Distribution. Fomitiporia calkinsii was described only for Mexico and USA ( Vlasák and Kout 2011; Decock and Amalfi 2013). Our new data represents the first record from South America.