atrata, atratum
Clothed in black
atratus
In mourning clothes
atrialba
Black & white (black cap, white to grayish gills)
atriavellaneus
Grey and pink
atricapillus
Without a hairy cap
atricapillus
Black haired (brown fibrils on stalk)
atro-olivacea
Black olive
atroalboides
Resembling atroalbus
atrobadius
Black & reddish brown (blackish red cap)
atrobrunnea
Blackish brown (cap reddish brown to blackish brown)
atrocaerulea
Bluish black cap
atrocinereum
Black-ashy
atrodisca, atrodiscum
Black disc (cap black or dark gray at center)
atrofolia
Black leaves (gills)
atrofuscus
A black blackish-brown
atrogleba
Black clod
atromarginatus
Possessing black margin (gill edges)
atropuncta
Black spotted
atropurpurea, atropurpureum
Purple black (cap dark red with black center)
atropurpureus
Dark purple
atrorubens
Dark red
atrorufa
Dark red
atrosanguineus
Dark blood
atrosquamosum, atrosquamosus
Black scaly
atrostipitatum, atrostipitatus
Black stalk
atrotomentosus
Black woolly
atroviolaceum
Blackish violet colored
atrovirens
Dark green
atroviride, atroviridis
Blackish green
attenuata, attenuatus
Narrowed, tapered
augeana
Pertaining to Augeos (uncleaned stable for 30 years, odor)
augustus
Majestic
aurantia
Orange
aurantiaca, aurantiacum
Reddish orange
aurantiacus
Bright orange
aurantiellum
Somewhat reddish-orange
aurantiisiccescens
Becoming orange and dry
aurantio-olivaceum
Olive green colored
aurantio-turbinatus
Cone or top shaped and golden as an orange
aurantiobasis
Reddish orange base