Key to species of Humidicutis worldwide, including un-named species
1. Occurring in the Austral-Pacific.......................................................................................................................................................15
1’. Occurring in the Americas..................................................................................................................................................................2
2. Pileus not orange-yellow, golden yellow or buff yellow....................................................................................................................4
2’. North American, pileus orange-yellow, golden yellow to buff yellow ..............................................................................................3
3. Odour skunk-like when drying; mean spore length 7.3 µm ................................................................................ Hum. auratocephala
3’. Odour not distinct; mean spores longer, 8–8.2 µm.............................................................................. Hum. marginata var. concolor
4. Occurring in North America; lamellae orange or pinkish orange ......................................................................................................5
4’. Occurring in Central or South America or the Caribbean Basin........................................................................................................6
5. Pileus entirely or partly orange, without green tints.......................................................................... Hum. marginata var. marginata
5’. Pileus olive green, olive brown or brick red in centre with orange margin or entirely tawny olive; bright orange lamellae .............. .............................................................................................................................................................. Hum. marginata var. olivacea
6. Occurring in Central America or Caribbean, pileus shades of vinaceous ..........................................................................................7
6’. Occurring in South America; pileus not vinaceous but may be pale pink........................................................................................12
7. In Puerto Rico, Caribbean, Greater Antilles, rosey vinaceous or vinaceous......................................................................................8
7’. In Central America, Pileus darker, deep magenta or vinaceous brown ..............................................................................................9
8. Pileus and lamellae entirely rosey vinaceous; basidiospores up to 10.4 µm long; in rain forest above 400 m asl; GenBank KF291146, KF291147; CFMR-PR-4715 .............................................................................................................................................. Hum. sp. 1
8’. Pileus rosey vinaceous or vinaceous with a pale margin; lamellae white or pale pink; basidiospores <8.5 µm long; in mid-elevation wet forest below 400 m asl; GenBank KF291150, KF291151; CFMR PR-6524 .............................................................. Hum. sp. 2
9. Pileus deep magenta, umbo rounded, lamellae vinaceous; in cloud forest, Belize; GenBank KF291110, KF291111, KF291112; CFMR BZ-3923.................................................................................................................................................................. Hum. sp. 3
9’. Pileus greyish pink or deep vinaceous brown, umbo acute, lamellae paler, white pale vinaceous pink or light grey-brown .........10
10. Young pileus deep vinaceous brown, lamellae light grey-brown or pale vinaceous pink, in Central Mexico. Hum. brunneovinacea
10. Pileus rose, greyish rose colour; lamellae white, in Panama .................................................................................... Hum. roseorubra
12. Pileus rose pink or greyish rose, robust, 20–60 mm, in S. Am. & New Zealand ............................................................ Hum. rosella
12’. Pileus not pink, smaller, up to 35 mm diam. ....................................................................................................................................13
13. Pileus entirely orange, apex acute; in Ecuador .................................................................................................... Hum. dictyocephala
13’. Pileus and lamellae green or partly green; apex rounded.................................................................................................................14
14. Pileus and lamellae green with orange margin, 22–35 mm; in Brazil ..................................................................... Hum. pindorama
14’. Pileus smaller, mycenoid, purple in centre with yellow-green margin; buff yellow stipe & lamellar margin; in Chile (coll. J. Thornhill)............................................................................................................................................................................ #FFCL860
15. Pileus and lamellae reddish brown; in New Zealand ................................................................................................. Hum. conspicua
15’. Pileus and lamellae not both reddish brown.....................................................................................................................................16
16. Pileus and lamellae rose pink or greyish rose; in New Zealand ...................................................................................... Hum. rosella
16’. Pileus and lamellae not pink.............................................................................................................................................................17
17. Pileus with green and reddish or yellowish brown; lamellae greenish or orangish yellow or yellow ochre colour ........................18
17’. Pileus green or another colour but lacking reddish or yellowish brown ..........................................................................................19
18. Stipe pinkish orange or yellow; pileipellis hyphae with rounded ends, not encrusted; spores 6–8 × 3.5–4.5 µm; in New Zealand ... .................................................................................................................................................................................. Hum. luteovirens
18’ Stipe green; pileus and stipe may have a purple tint; pileipellis hyphae with acute ends, encrusted with pigment; spores larger, 7.5–9.5 × 4.5–6.3 µm; in Australia .......................................................................................................................... Hum. arcohastata
19. Pileus and stipe green; lamellae bright orange; in Australia ........................................................................................... Hum. taekeri
19’ Pileus and stipe colour combination different ..................................................................................................................................20
20. Pileus olive or bottle green, may have buff or orange-brown color .................................................................................................21
20’. Pileus without olive or bottle green..................................................................................................................................................22
21. Basidiomes all green; helical-encrusted pileipellis hyphae........................................................................................ Hum. helicoides
21’. Basidiomes not entirely green; pileipellis hyphae lack helical encrustations ..................................................................................22
22. Lamellae narrowly attached; toruloid clamps on basidia rare or absent ..........................................................................................23
22’. Lamellae broadly attached; clamps on basidia often toruloid (open-loop) ......................................................................................24
23. Pileus green or orange-brown; lamellae yellow; pileipellis hyphae typical, lacking swollen ends ................................ Hum. woodii
23’ Pileus vinaceous brown, lamellae white or light brown-tinted; pileipellis hyphal ends swollen or subglobose ................................. ...................................................................................................................................................................... Hygrocybe badioclavata
24. Pileus magenta, vinaceous or red colours, may have green; in Australia .........................................................................................25
24’. Pileus without magenta, vinaceous or cherry red colours ................................................................................................................26
25. Lamellae yellow; stipe blue above, magenta below........................................................................................... Hum. viridimagentea
25’. Lamellae olive green, vinaceous; stipe red, turning green ............................................................................................. Hum. bagleyi
26. Pileus lilac; lamellae malachite green; stipe lilac; in Australia ........................................................................... Hum. lilacinoviridis
26’. Basidiome colour combinations not as above ..................................................................................................................................27
27. Pileus dark green with blue-green and lilac; in New Zealand ................................................................................... Hum. multicolor
27’. Colour combination not as above; in Hawaii ...................................................................................................................................28
28. Pileus and lamella pale orange, orange rufus, flesh colour; stipe white.......................................................................... Hum. peleae
28’. Basidiomes entirely deep yellow.................................................................................................................................... Hum. poilena