North American Species of Crepidotus

Subgenus Crepidotus

Clamp connections none on the hyphae of basidiocarp. The vegetative mycelium has not been studied.

TYPE SPECIES: Crepidotus mollis (Fr.) Staude

Key to Sections

1. Pileus with red dissolved pigment in the hyphae of the cutis and hypoderm; spores distinctly ornamented
Section Cinnabarini
1. Not as above
2. Spores fusoid to subfusoid in face view, thin-walled, usually "pinkish buff" in deposit
Section Tubariopsis
2. Spores not as above
3. Pileus structure duplex, a compactly interwoven basal layer usually less than half the diameter of the pileus trama and a loosely floccose upper zone
Section Stratosi
3. Not as above
4. Spores globose and ornamented
Section Parvuli
4. Spores typically longer than broad
5. Cuticular hyphae and at times also pileus trama hyphae gelatinized often forming a gelatinous surface stratum
Section Crepidotus
5. Cuticular hyphae and those of pileus trama not gelatinous
Section Versuti

Section Cinnabarini sec. nov.

Sporae manifeste ornatae; pileus in cuticulae et hypodermis hyphis materiam cinnabarirubri coloris gerens, materia coloris in KOH flavida deinde sine colore facta.

Spores distinctly ornamented; pileus with cinnabar-red pigment in the hyphae of the cuticle and hypoderm, the pigment in KOH becoming yellowish then colorless.

TYPE SPECIES: Crepidotus cinnabarinus Pk.

1. Only one species known

Section Tubariopsis sec. nov.

Sporae fusoideaee demum subfusoideae in fronte, tenuisepatatae, similes Tubariae sporis.

Spores fusoid to subfusoid in face view, thin-walled, reminding one of spores of Tubaria.

TYPE SPECIES: Crepidotus pubescens Bres.

1. Only one species known

Section Stratosi sec. nov.

Trama pilei duplex, in huius inferiore parte ex densis intertextis hyphis, in superiore parte ex laxis intertextis hyphis composita.

Pileus trama duplex, lower portion of densely interwoven hyphae, upper portion of loosely interwoven hyphae.

TYPE SPECIES: Crepidotus stratosus sp. nov.

1. Spores ellipsoid to ovoid
1. Spores globose or subglobose

Section Parvuli sec. nov.

Sporae globosae vel subglobosae.

Spores globose or subglobose.

TYPE SPECIES: Crepidotus parvulus Murr.

1. Lamellae distant; pileus 1-4 mm broad
1. Lamellae close or crowded; pileus 1-5 cm broad

Section Crepidotus

Cuticle and, at times, the pileus trama gelatinous.

TYPE SPECIES: Crepidotus mollis (Fr.) Staude.

1. Pileus epicuticular hyphae, colorless
1. Pileus epicuticular hyphae or at least some of them brownish, often forming scales
2. Spores 8-10 x 5.5-7 µ; pileus at first ochraceous to Isabella color or snuff brown
2. Spores 6-8 µ long; pileus at first whitish or pallid, often becoming ochraceous when dried
3. Cuticle a gelatinous stratum differentiated from the non-gelatinous pileus trama
3. Cuticle gelatinization also extending into the pileus trama
4. Pleurocystidia absent
4. Pleurocystidia present
5. Epicuticular brown hyphae not incrusted
5. Epicuticular brown hyphae, or at least some of them, incrusted
6. Pleurocystidia absent
6. Pleurocystidia present
7. Cuticular gelatinization confined to a well-defined stratum; occurring in the temperate zone
7. Cuticular gelatinization also extending into the pileus trama
8. Pleurocystidia cylindric-fusoid
8. Pleurocystidia clavate, spathulate, or flask-shaped with a neck which may be forked

Section Versuti sec. nov.

Cuticula sicca, plerumque fibrillosa vel perraro glabrosa; sporae ellipsoideae vel raro lanceolatae demum graniformes.

Cuticle dry, usually fibrillose, or more rarely glabrous; spores ellipsoid or rarely lanceolate to pip-shaped.

TYPE SPECIES: Crepidotus versutus (Pk.) Sacc.

1. Stipe present
1. Stipe absent
2. Spores verruculose-asperulate; pileus fuscous
2. Spores smooth; pileus watery-brown when wet, dingy buff when dry
3. Spores 7-11 x 4.5-6 µ
3. Spores smaller (8 µ or less in length)
4. Spores pip-shaped, lanceolate, or subovoid, 2.8-3.6 µ broad
4. Spores ellipsoid, or short-ovoid, 4.3-6 µ broad
5. Pileus colored at maturity
5. Pileus white
6. Pileus brick reddish, glabrous or subglabrous
6. Pileus finally pinkish buff, or more rarely gray-buff, granulose-pubescent
7. Spores short-ellipsoid, or more often globose to subglobose, punctate (see also Sec. Parvulae)
7. Spores ellipsoid, smooth

 *See Excluded Species