Notes:
The second collection (see Observation 230596) of this beautiful and as of yet unidentified agaric. The pilei seen here are much browner, possibly due to age and/or or drier environmental conditions. Under the scope we found a sterile gill edge full of thin-walled, more or less finger-like cheilocystidia, along with sparser, thick-walled, apically encrusted (?) pleurocystidia, some appearing dextrinoid. Images of and notes on the charismatic stipe hairs are conspicuously and disappointingly absent. Long suspected of belonging to some xeruloid genus, we found the pileipellis to be a cutis, ruling out any such taxa with pileosetae (Xerula s. str. and Paraxerula). The hyaline spores are subglobose to broadly ellipsoid and somewhat angular, weakly amyloid (?), smooth, with a prominent hilar appendage and what appears to be a single, very large guttule taking up most of their interior.

The material should be reexamined on a higher quality microscope to confirm unclear features and record those which were un- or under-documented during the course.

Substrate: Some FBs attached to wood, but with rooting stipes penetrating deep into soil, perhaps connected to buried wood. true substrate not known.

Habitat: High-elevation oak cloud forest

Ecoregion: Talamanca Montane Forests (NA0167)

Collector(s): S. Landrein

Collection #: CUER035

Collected for the 2016 Organization for Tropical Studies “Fungi and Fungus-Like Organisms” Course

Species Lists

Images

Canon EOS 6D + Tokina 35mm f/2.8 AT-X PRO DX Macro + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/11, ISO 200
Focus Stacked with Zerene Stacker (6 Images)
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
Canon EOS 6D + MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/160 sec, f/16, ISO 200
40x – Water
Pileipellis
100x – Water
Pileipellis
400x – Water
Gill Edge
100x – Water
Cheilocystidia
400x – Water
Cheilocystidia
1000x – Melzer’s
Cheilocystidia
1000x – Melzer’s
Cheilocystidia
1000x – Melzer’s
Cheilocystidia & Spores
1000x – Melzer’s
Pleurocystidia
1000x – Melzer’s
Pleurocystidia
1000x – Melzer’s
Pleurocystidia
1000x – Melzer’s
Pleurocystidia
1000x – Melzer’s
Pleurocystidia
1000x – Melzer’s
Spores
1000x – Melzer’s

Proposed Names

29% (1)
Recognized by sight
87% (1)
Used references: Private correspondence w/ Dr. Petersen

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= Observer’s choice
= Current consensus

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