Name: Coprinopsis subsect. Nivei
Most Confident Observations:
Copyright © 2017 Jacob Kalichman (Pulk)
Copyright © 2018 Julie Jones (foobear)
Copyright © 2017 Jared McRae (redeye311)
Version: 2
Previous Version 


First person to use this name on MO: Danny Newman
Editors: Jacob Kalichman

Nomenclature:

Rank: Subsection

Status: Accepted

Name: Coprinopsis subsect. Nivei

ICN Identifier: missing

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Notes on Taxonomy: [Edit]

1. Av. length of spores > 12 µm
2. Basidia 4-spored; pileus white at first
3. Spores 12—19 × 11—15.5 µm; spores ± limoniform; pleurocystidia present: C. niveus
3. Spores 10—15 × 6.5—8.5 µm; spores ± 6-angular (hexagonal); pleurocystidia absent or very sparse: C. cothurnatus
2. Basidia 2-spored; pileus grey or cream-grey, sometimes white at first: C. pachyspermus
1. Av. length of spores < 12 µm
4. Spores oval or ellipsoid, sometimes slightly cylindrical
5. Basidia 2-spored: C. bellulus
5. Basidia 4-spored
6. Cystidia absent: C. cortinatus
6. Cystidia present
7. Both cheilo- en pleurocystidia present
8. Pileus very small, expanded < 6 mm; average length of spores < 9 µm
9. In lawns, terrestrial, not on dung, young pileus white; spores 7—9.5 × 5—6.5 µm: C. idae
9. On dung; pileus grey or white and then breadth of spores < 5 µm
10. Young pileus grey; spores 7.5—9.5 × 5—6 µm: C. poliomallus
10. Young pileus white; spores 6—7.5(—8) x 3.5—4.5(—5) µm: C. pseudocortinatus
8. Pileus larger, 5—25 mm when expanded or av. length of spores > 9 µm
11. Expanded pileus up to 25 mm; av. length of spores < 9 µm; on dung: C. utrifer
11. Expanded pileus 5—12 mm; av. length of spores > 9 µm
12. On grasses. Cheilocystidia 20—45 × 8—13 µm: C. pilosotomentosus
12. On wood. Cheilocystidia 50—80 × 20—35 µm: C. nemoralis
7. Only cheilocystidia present
13. Cheilocystidia utriform: C. candidatus
13. Cheilocystidia (sub)globose or ellipsoid
14. Caulocystidia present, with finger-like diverculations at apex; cheilocystidia (sub)globose to ellipsoid, partly also diverculate: C. ramosocystidiatus
14. Caulocystidia absent, cheilocystidia without diverticulations in apical part: see discussion under C. cortinatus
4. Spores differently shaped
15. Spores with rounded angles (4—5-angular), 8—10.5 × 8—10 µm; pleurocystidia present
16. Ring present: C. ephemeroides
16. Ring absent
17. Cheilocystidia in part lageniform. On dung: C. cordisporus
17. No lageniform cheilocystidia present. On vegetable debris: C. patouillardii
15. Spores differently shaped; breadth of spores < 8 µm or spores limoniform; pleurocystidia present or absent
18. Pleurocystidia present
19. Breadth of spores 5—6 µm, heart- or pear-shaped: C. cardiasporus
19. Breadth of spores 7.5—11.5 µm, limoniform: C. pseudoniveus
18. Pleurocystidia absent
20. Veil white, often cream-coloured or slightly ochraceous at centre of pileus; spores ± 6-angular in frontal view, c. 5—6 µm broad; with two bumps at each side: C. iocularis
20. Veil at centre of pileus dark grey, usually with greenish hue; spores narrowly ovoid or amygdaliform, c. 4—5 µm broad: C. coniophorus

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