Campanophyllum proboscideum ( Fries 1851: 38 ) Cifuentes & R.H. Petersen

Reschke, Kai, Lotz-Winter, Hermine, Fischer, Christian W., Hofmann, Tina A. & Piepenbring, Meike, 2021, New and interesting species of Agaricomycetes from Panama, Phytotaxa 529 (1), pp. 1-26 : 17

Campanophyllum proboscideum ( Fries 1851: 38) Cifuentes & R.H. Petersen in Cifuentes et al. (2003: 289), Fig 13b, c

Description: —Basidiocarps cyphelloid-crepidotoid, dorsally attached to substrate. Pileus 1.0–9.0 cm diam., spathulate, flabelliform or spoon shaped, sometimes lobed, with inrolled to decurved margin, surface moist, radially fibrillose and/or streaked, initially yellowish white to pale yellow (4A2–3), later decolouring brownish orange to light brown (5C4, 6C4, 7C4–D4), margin and area below attachment point sometimes remaining yellowish white, hygrophanous. Lamellae extending radially from attachment point within pseudostipe, arcuate, 1.0–2.0 mm broad, thin, very crowded, sometimes forked, white to yellowish white (4A1–2). Pseudostipe 0.3–3.0 cm long, excentric to lateral, emerging from the upper side of the pileus, hollow, concolourous with the pileus, discolouring to blackish-ochre. Trama white, 1.0–4.0 mm thick, fleshy. Odour indistinct, taste not tested.

Basidiospores 4.0–4.1–5.0 × 2.0–2.2–2.5 µm, Q = 1.40–1.90–2.50 (n = 22 spores of 2 specimens), cylindricalellipsoid, smooth, hyaline, thin-walled, inamyloid. Basidia 15–17 × 4.0–5.0 µm, narrowly clavate to clavate, 4-spored. Lamellar edge sterile. Cheilocystidia abundant, 20–30 × 5.0–9.0 µm, subcylindrical, clavate to lageniform often somewhat irregular, hyaline, thin-walled. Pleurocystidia scattered between basidia, 18–20 × 2.0–3.0 µm, subcylindrical to lageniform. Pileipellis a cutis, with pale brown, intracellular pigment. Hyphae with refractive content present in all parts of the basidiocarp. Clamp connections frequently present in all parts of the basidiocarp.

Habitat: —In groups on dead wood of broad-leaved trees in montane forests in in elevations around 2000 m a.s.l. in Chiriquí Province, Panama.

Notes: — Campanophyllum proboscideum was described by Fries (1851) as Lentinus proboscideus from Costa Rica. Cifuentes et al. (2003) combined it into the monotypic genus Campanophyllum Cifuentes & R.H. Petersen and designated a neotype for this species. Campanophyllum proboscideum is known from montane forests in Colombia, Costa Rica, Ecuador, and Mexico ( Cifuentes et al. 2003). Its known distribution range is here extended to include also montane Quercus -dominated forests in Panama. Campanophyllum proboscideum was proposed and is currently assessed to be included in the IUCN red list as endangered, because of a presumably small population and strong habitat decline (http://iucn.ekoo.se/iucn/species_view/488791/).

Specimens examined: — PANAMA. Chiriquí Province: Cerro Punta, Las Nubes, Sendero Retoño , montane Quercus -dominated cloud forest, on dead wood of broad-leaved tree, 2200 m a.s.l., N 8°53’36.8” W 82°37’4.2’’, 28 May 2014, H. Lotz-Winter , S. Cáceres , S. Rudolph , R. V. Villareal PAN46 ( UCH9135 , M-0312077)!; Cerro Punta , Sendero Los Quetzales close to Mirador Alto Respingo , montane cloud forest, on trunk of standing broad-leaved tree, 2500 m a.s.l., N 8°50’46.5” W 82° 31’49.1’’, 20 July 2015, H. Lotz-Winter , S. Cáceres , J. Rodríguez , R. V. Villareal PAN327 ( UCH8970 , M-0312075)!; Alto Boquete , Alto Chiquero , Sendero Los Quetzales , montane cloud forest, on dead wood of broad-leaved tree, 1860 m a.s.l., N 8°50’53.5” W 82°29’35.5’’, 23 July 2015, H. Lotz-Winter , J. Rodríguez PAN373 ( UCH8996 , M-0312076)!; ibid., on trunk of standing broad-leaved tree, 1830 m a.s.l., N 8°51’01.5” W 82°29’35.7’’, 07 June 2017, K. Reschke, M. Cuevas KaiR434 ( UCH 11752, M-0312074) !.