Inocybe castaneicolor La Rosa, Bizio, Saitta & Tedersoo, 2017

Rosa, Alfonso La, Bizio, Enrico, Saitta, Alessandro & Tedersoo, Leho, 2017, Inocybe castaneicolor (Agaricales, Basidiomycota), a new species in section Splendentes, Phytotaxa 316 (1), pp. 79-87 : 82-83

Inocybe castaneicolor La Rosa, Bizio, Saitta & Tedersoo , sp. nov. ( Fig. 1 ; Pl. 1)

MycoBank MB: 819297

Type:— ITALY. Sicily: Caltanissetta, Sughereta di Niscemi , 01 October 2015, 232 m asl, sandy soil under Quercus suber L., 37 º 05’35.690” N 14 º 26’3.859” E, A. Saitta, (holotype TU124382 !; isotype MCVE29125 !) .

Diagnosis:— Inocybe castaneicolor is distinguished from other known Inocybe species by having small-sized basidiomata with a castaneous pileus, an evident umbo, darker in the center, and with a sloped and fibrillose-rimose margin; central stipe, with marginate and always whitish bulb; smooth, subamygdaliform to subnavicular basidiospores; ventricose-subusiform pleurocystidia, with apical crystals; and pyriform to clavate paracystidia.

Description:— Pileus up to 30 mm, with an evident umbo, margin castaneous (2.5YR: 5/6 red, 6/8 light red; 5YR: 5/6, 5/8 yellowish red), darker in the center (2.5YR: 4/4 reddish brown, 4/6, 4/8 yellowish red; 5YR: 4/6 yellowish red), with a sloped and fibrillose-rimose margin. Veils absent. Lamellae adnate-emarginate, close, moderately crowded, whitish-greyish to argillaceous-beige (2.5YR: 4/4 reddish brown, 4/6, 4/8 yellowish red; 5YR: 4/6 yellowish red), stained rust with age and edge whitish. Stipe central, cylindric, fistulose, whitish, pink to ochraceous with age (5YR: 8/4 pink; 7.5YR: 8/4 pink, 8/6 reddish yellow), furfuraceous, up to 50× 3 mm, 6 mm at the bulb, with marginate and always whitish bulb. Flesh white. Odor spermatic.

Basidiospores (9.1)10.7–14(15.6) × (5)5.3–5.8(6.2) μm, Q = (1.8)2.0–2.4(2.5), smooth, subamygdaliform to subnavicular, with suprahilar plage and subconical apex, sometimes elongated and pointed at one extremity. Basidia 25–30 × 10–12 μm, tetrasporic, clavate. Pleurocystidia (50)60–70 × 15–20 μm, abundant, ventricose-subusiform, indistintly lageniform, thick-walled up to 2.5 μm, with apical crystals variable in number and size; ammoniacal reaction negative. Cheilocystidia frequent, similar to pleurocystidia. Paracystidia 20–25 × 9–12 μm, pyriform to clavate, abundant. Caulocystidia similar in shape and size to hymenial cystidia, abundant and present over the whole stipe surface, arranged in tufts, mixed with cauloparacystidia. Clamp connections present in all tissues.

Etymology:—the specific epithet (Lat.), refers to the castaneous color of the pileus surface of the new species.

Geographical distribution:—known only for the type locality in Sicily, Italy.

Figures

FIGURE 1. Phylogram inferred from maximum likelihood analysis of ITS sequences of Inocybe. Species names are followed by GenBank accession numbers. The new species is in bold. Bootstrap support values of the ML analysis ≥ 80% are displayed above each node. The phylogram is rooted with Crepidotus mollis and C. applanatus.