aberrans
Wandering from the way, aberrant, not typical

abiegna
Related to fir

abieticola
Fir dwelling

abietina, abietinum, abietinus, abietis
Related to fir (Abies)

abietum
Of the fir tree

abjecta
Mean, in the sense of small

Abortiporus
Aborted pores

abortivum, abortivus
Abortive, missing or deformed parts

abramsii
Leroy Abrams (1874-1956) American botanist

abrupta
Abrupt swollen base

abruptibulbus
Abrupt swollen base

abruptus
Abrupt swollen base

Abstoma
Without a mouth

abstrusa
Hidden

abundans
Refers to habit of fruiting in abundance

acadiensis
Growing in Acadia

acanthocystis
With thorny, prickly cystidia

acanthoides
Pertaining to or resembling the acanthus

acerbum, acerbus
Bitter

acericola
Growing on maple

acerinum
Pertaining to maple

acerosus
Very acrid, very sharp

acerrimus
Very acrid

acervata, acervatus, acervus
In clusters, heaped up

Acetabula, acetabulum
Like a vinegar cup

achimenes
An amber colored plant

acia
Thread, yarn

acicula
Bristle, needle, splinter (very tiny mushroom)

acidus
Acid taste

acre
Acrid

acrifolia
Sharp leaves (gills)

acris
Sharp

acrisiccescens
Becoming acrid and dry (bitter when cooked)

acuminatum, acuminatus
Tapered to a narrow point

acuta, acutus
Pointed, acute

acutesquamosa, acutesquamosus
Sharp scales

acutoconica, acutoconicus
Sharply conic

acutus
Sharp-acute umbo

adaequata
Sufficient

adhaerens
Adherent, attached

adiposa
Fatty