sidebanr.jpg - 2978 Bytes

Key to Phaeocollybia

Known taxa include: P. ambigua, P. caudata, P. pseudolugubris, P. oligoporpa, P. quercetorum, P. singularis, P. subarduennensis, P. subattenuata, & P. talamancensis. Previous works on Neotropical montane Phaeocollybias were published by Singer (Mycol. Helvetica 2: 247-266. 1987), Horak & Halling (Mycologia 83: 464-472. 1991), and Bandala & Montoya (Mycotaxon 52: 397-422. 1994, including additional literature citations on Mexican taxa). In this latter publication, there is a revised and quite useful subgeneric classification.

Vouchers for all collections are on deposit at the Universidad de Costa Rica (USJ) mycological herbarium or Instituto Nacional de Biodiversidad (INB). Duplicates are in the Field Museum (F) and the New York Botanical Garden (NY).

1. Clamp connections present, especially on the cheilocystidia . . . . 2

2. Spores up to 7 µm, ovoid to subellipsoid . . . . P. subarduennensis Singer

2. Spores 7 µm or greater, ellipsoid to limoniform . . . . 3

3. Spores subellipsoid to subamygdaliform, finely verrucose, with a germ pore . . . . P. subattenuata Singer

or P. talamencensis Halling & Horak, sp. nov.

3. Spores limoniform, strongly verrucose, mucronate . . . . P. oligoporpa Singer

1. Clamp connections absent . . . . 4

4. Spores up to 7 µm, subglobose to subovoid or subellipsoid . . . . 5

5. Pseudorhiza abruptly tapering; pileus surface with fine squamules; lamellae pale brown to brown without lilac tints . . . . P. caudata Horak & Halling

5. Pseudorhiza long radicating and not abruptly tapered; pileus surface glabrous; lamellae tinged lilac pink when young . . . . P. pseudolugubris Bandala & Horak

4. Spores 7 µm or longer, ellipsoid to subamygdaliform to limoniform-mucronate . . . . 6

6. Spores ellipsoid and sometimes with a faint germ pore . . . . P. ambigua Horak & Halling

6. Spores amygdaliform to limoniform-mucronate . . . . 7

7. Pileus black with lavender tints; cheilocystidia slender-fusoid with capitate apex . . . . P. singularis Horak & Halling

7. Pileus brown to orangish clay color, sometimes with spots; cheilocystidia cylindric to subclavate . . . . P. quercetorum Singer