• (1) Aaosphaeria arxii - Acarospora interrupta
• (2) Acarospora interspersa - Acremoniella rugulosa
• (3) Acremoniella tarchiniana - Actidium pulchellum
• (4) Actidium pulchra - Aecidium helianthi-mollis
• (5) Aecidium heliotropidatum - Aegerita epixyla
• (6) Aegerita ferruginea - Agaricus cephalixus
• (7) Agaricus ceraceus - Agaricus formosus
• (8) Agaricus fornicatus - Agaricus metatus
• (9) Agaricus miamensis - Agaricus rajap
• (10) Agaricus ramealis - Agaricus udus
• (11) Agaricus ulmarius - Alectoria chalybeiformis f. prostrateosteola
• (12) Alectoria cincinnata - Allophylaria sublicaeformis
• (13) Allophylaria subliciformis - Amandinea turgescens
• (14) Amanita abrupta - Amanita phalloides striatula
• (15) Amanita phalloides var. alba - Amerosporium circinatum
• (16) Amerosporium concinnum - Anaptychia latifolia
• (17) Anaptychia leucomela - Anthina pallida
• (18) Anthina penicillata - Anthracothecium decipiens
• (19) Anthracothecium denudatum - Apiosporium melampyri
• (20) Apiosporium microscopicum - Archephoma cycadeoidellae
• (21) Archeterobasidium syrtae - Arthonia compensatula
• (22) Arthonia compensatula var. lineolans - Arthonia subsimillima
• (23) Arthonia subspadicea - Arthothelium ruanun
• (24) Arthothelium rugosum - Ascobolus furfuraceus var. nudus
• (25) Ascobolus fushanus - Ascochyta plantaginis
• (26) Ascochyta plumbaginicola - Ascotaiwania wulai
• (27) Ascotremella faginea - Aspergillus pusillus
• (28) Aspergillus pyramidalis - Aspidothelium scutellicarpum
• (29) Aspidothelium trichothelioides - Asterophoma mazaediicola
• (30) Asterophora agaricicola - Atractium lusitanicum
• (31) Atractium micropus - Azymoprocandida mesenterica