| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| ARGE4 | Arthopyrenia gemmata (Ach.) A. Massal. | Acrocordia gemmata | Monoblastiaceae
|
| ARHA8 | Arthopyrenia halodytes (Nyl.) Arnold | Pyrenocollema halodytes | Pyrenulaceae
|
| ARHY4 | Arthopyrenia hyalospora (Nyl.) Fink | Lithothelium hyalosporum | Pyrenulaceae
|
| ARLA26 | Arthopyrenia lapponica Anzi | Arthopyrenia analepta | Arthopyreniaceae
|
| ARLE11 | Arthopyrenia leucochlora Mull. Arg. | Anisomeridium leucochlorum | Monoblastiaceae
|
| ARLY4 | Arthopyrenia lyrata R. C. Harris | shell lichen | Arthopyreniaceae
|
| ARMA26 | Arthopyrenia macrospora Fink | Acrocordia megalospora | Monoblastiaceae
|
| ARMA22 | Arthopyrenia majuscula (Nyl.) Zahlbr. | shell lichen | Arthopyreniaceae
|
| ARMA23 | Arthopyrenia malaccitula (Nyl.) Zahlbr. | shell lichen | Arthopyreniaceae
|
| ARMI11 | Arthopyrenia minor R. C. Harris | shell lichen | Arthopyreniaceae
|
| AROB7 | Arthopyrenia oblongens R. C. Harris | shell lichen | Arthopyreniaceae
|
| ARPA32 | Arthopyrenia parvula Zahlbr. | Anisomeridium biforme | Monoblastiaceae
|
| ARPI5 | Arthopyrenia pinicola (Hepp) A. Massal. | Arthopyrenia cinereopruinosa | Arthopyreniaceae
|
| ARPL9 | Arthopyrenia planorbis (Ach.) Mull. Arg. | shell lichen | Arthopyreniaceae
|
| ARPL10 | Arthopyrenia plumbaria (Stizenb.) R. C. Harris | shell lichen | Arthopyreniaceae
|
| ARPR11 | Arthopyrenia prospersella (Nyl.) Zahlbr. | Pyrenocollema prospersellum | Pyrenulaceae
|
| ARQU3 | Arthopyrenia quinqueseptata (Nyl.) Mull. Arg. | Polymeridium quinqueseptatum | Trypetheliaceae
|
| ARRA6 | Arthopyrenia rappii Zahlbr. | Rapp's shell lichen | Arthopyreniaceae
|
| ARSA14 | Arthopyrenia sanfordensis Zahlbr. | Anisomeridium excaecariae | Monoblastiaceae
|
| ARSP12 | Arthopyrenia sphaeroides (Wallr.) Zahlbr. | Acrocordia gemmata | Monoblastiaceae
|
| ARSU20 | Arthopyrenia sublitoralis (Leighton) Arnold | Pyrenocollema sublitorale | Pyrenulaceae
|
| ARSU21 | Arthopyrenia submuriformis R. C. Harris | Strigula submuriformis | Strigulaceae
|
| ARSU22 | Arthopyrenia subprostans (Nyl.) Mull. Arg. | Anisomeridium subprostans | Monoblastiaceae
|
| ARTA5 | Arthopyrenia taxodii R. C. Harris | shell lichen | Arthopyreniaceae
|
| ARTE13 | Arthopyrenia tenuis R. C. Harris | Strigula americana | Strigulaceae
|
| ARTE12 | Arthopyrenia texensis (Cooke) D. Hawksw. | Texas shell lichen | Arthopyreniaceae
|
| ARTI3 | Arthopyrenia tichothecioides Arnold | Pyrenocollema tichothecioides | Pyrenulaceae
|
| ARWI3 | Arthopyrenia willeyana R. C. Harris | Anisomeridium nyssigenum | Monoblastiaceae
|
| ARTHO2 | Arthopyrenia A. Massal. | shell lichen | Arthopyreniaceae
|
| ARAB5 | Arthothelium abnorme (Ach.) Mull. Arg. | | Uncertain Lichen Family
|
| ARAD4 | Arthothelium adveniens Nyl. | | Uncertain Lichen Family
|
| ARAL19 | Arthothelium albovirescens (Nyl.) Fink | | Uncertain Lichen Family
|
| ARAN12 | Arthothelium anastomosans (Ach.) Arnold | | Uncertain Lichen Family
|
| ARDI22 | Arthothelium distendens (Nyl.) Mull. Arg. | | Uncertain Lichen Family
|
| ARGR16 | Arthothelium gregarium (Willey) Zahlbr. | | Uncertain Lichen Family
|
| ARHA7 | Arthothelium hallii (Tuck.) Zahlbr. | | Uncertain Lichen Family
|
| ARIL | Arthothelium ilicinum (Taylor) P. James | Arthonia ilicina | Arthoniaceae
|
| ARIN16 | Arthothelium interveniens (Nyl.) Zahlbr. | | Uncertain Lichen Family
|
| ARMA24 | Arthothelium macounii (G. Merr.) W. Noble | | Uncertain Lichen Family
|
| ARMA25 | Arthothelium macrothecum (Fee) A. Massal. | | Uncertain Lichen Family
|
| AROR4 | Arthothelium orbilliferum (Almq.) Hasse | | Uncertain Lichen Family
|
| ARPR10 | Arthothelium pruinascens Zahlbr. | | Uncertain Lichen Family
|
| ARRU11 | Arthothelium ruanideum (Nyl.) Arnold | Arthothelium ruanun | Uncertain Lichen Family
|
| ARRU10 | Arthothelium ruanun (A. Massal.) Korber | | Uncertain Lichen Family
|
| ARSA13 | Arthothelium sanguineum (Willey) Zahlbr. | | Uncertain Lichen Family
|
| ARSP11 | Arthothelium spectabile A. Massal. | | Uncertain Lichen Family
|
| ARSU19 | Arthothelium subcyrtodes (Willey) Hasse | | Uncertain Lichen Family
|
| ARTA2 | Arthothelium taediosum (Nyl.) Mull. Arg. | | Uncertain Lichen Family
|
| ARVI15 | Arthothelium violascens (Nyl.) Zahlbr. | | Uncertain Lichen Family
|
| ARTHO3 | Arthothelium A. Massal. | arthothelium | Uncertain Lichen Family
|
| ARCA34 | Arthraxon castratus (Griffiths) Naray. ex Bor | castrate carpgrass | Poaceae
|
| ARCIC | Arthraxon ciliaris Beauv. var. cryptatherus Hack. | Arthraxon hispidus | Poaceae
|
| ARHIC2 | Arthraxon hispidus (Thunb.) Makino var. cryptatherus (Hack.) Honda | Arthraxon hispidus | Poaceae
|
| ARHI3 | Arthraxon hispidus (Thunb.) Makino | small carpgrass | Poaceae
|
| ARTHR | Arthraxon Beauv. | carpgrass | Poaceae
|
| ARPE14 | Arthrocnemum perenne (P. Mill.) Moss | Sarcocornia perennis | Chenopodiaceae
|
| ARSU11 | Arthrocnemum subterminale (Parish) Standl. | Parish's glasswort | Chenopodiaceae
|
| ARTHR4 | Arthrocnemum Moq. | arthrocnemum | Chenopodiaceae
|
| ARPI7 | Arthrophyllum pinnatum (Lam.) C. B. Clarke | Polyscias cumingiana | Araliaceae
|
| ARCI11 | Arthropodium cirrhatum (G. Forst.) R. Br. | rock-lily | Liliaceae
|
| ARTHR8 | Arthropodium R. Br. | rock lily | Liliaceae
|
| ARAE2 | Arthrorhaphis aeruginosa R. Sant. & Tonsberg | | Arthrorhaphidaceae
|
| ARAL60 | Arthrorhaphis alpina (Schaerer) R. Sant. | | Arthrorhaphidaceae
|
| ARCI60 | Arthrorhaphis citrinella (Ach.) Poelt | | Arthrorhaphidaceae
|
| ARGR19 | Arthrorhaphis grisea Th. Fr. | | Arthrorhaphidaceae
|
| ARTHR5 | Arthrorhaphis Th. Fr. | arthrorhaphis | Arthrorhaphidaceae
|
| ARPO13 | Arthrosporum populorum A. Massal. | | Catillariaceae
|
| ARTHR7 | Arthrosporum A. Massal. | arthrosporum | Catillariaceae
|
| ARCI2 | Arthrostemma ciliatum Pav�n ex D. Don | pinkfringe | Melastomataceae
|
| ARFR10 | Arthrostemma fragile Lindl. | | Melastomataceae
|
| ARLA19 | Arthrostemma latifolium D. Don | Arthrostemma ciliatum | Melastomataceae
|
| ARTHR3 | Arthrostemma Pav�n ex D. Don | arthrostemma | Melastomataceae
|
| ARCA16 | Arthrostylidium capillifolium Griseb. | Arthrostylidium farctum | Poaceae
|
| ARFA8 | Arthrostylidium farctum (Aubl.) Soderstr. & Lourteig. | old man's beard | Poaceae
|
| ARMU2 | Arthrostylidium multispicatum Pilger | woodland climbing bamboo | Poaceae
|
| ARSA6 | Arthrostylidium sarmentosum Pilger | forest climbing bamboo | Poaceae
|
| ARTHR2 | Arthrostylidium Rupr. | climbing bamboo | Poaceae
|
| ARAL7 | Artocarpus altilis (Parkinson) Fosberg | breadfruit | Moraceae
|
| ARCH13 | Artocarpus champeden (Lour.) Spreng. | Artocarpus integer | Moraceae
|
| ARCH14 | Artocarpus champeden (Lour.) Stokes | Artocarpus integer | Moraceae
|
| ARCO21 | Artocarpus communis J.R. & G. Forst. | Artocarpus altilis | Moraceae
|
| AREL9 | Artocarpus elasticus Reinw. ex Blume | artocarpus | Moraceae
|
| ARHE2 | Artocarpus heterophyllus Lam. | jackfruit | Moraceae
|
| ARHI7 | Artocarpus hirsutus Lam. | hirsute artocarpus | Moraceae
|
| ARIN17 | Artocarpus integer (Thunb.) Merr. | chempedak | Moraceae
|
| ARIN18 | Artocarpus integer auct. | Artocarpus heterophyllus | Moraceae
|
| ARIN19 | Artocarpus integrifolius L. f. | Artocarpus integer | Moraceae
|
| ARIN20 | Artocarpus integrifolius auct. | Artocarpus heterophyllus | Moraceae
|
| ARMA28 | Artocarpus mariannensis Trecul | artocarpus | Moraceae
|
| AROD2 | Artocarpus odoratissimus Blanco | marang | Moraceae
|
| ARRI4 | Artocarpus rigidus Blume | monkey Jack | Moraceae
|
| ARTA3 | Artocarpus tamaran Becc. | artocarpus | Moraceae
|
| ARTOC | Artocarpus J.R. & G. Forst. | breadfruit | Moraceae
|
| ARES4 | Arum esculentum L. | Colocasia esculenta | Araceae
|
| ARIN21 | Arum indicum Lour. | Alocasia macrorrhizos | Araceae
|
| ARIT | Arum italicum P. Mill. | Italian lords and ladies | Araceae
|
| ARMA29 | Arum maculatum L. | cuckoo pint | Araceae
|
| ARUM2 | Arum L. | arum | Araceae
|
| ARAC5 | Aruncus acuminatus (Rydb.) Rydb. | Aruncus dioicus var. acuminatus | Rosaceae
|
| ARALP2 | Aruncus allegheniensis Rydb. var. pubescens (Rydb.) Fern. | Aruncus dioicus var. pubescens | Rosaceae
|
| ARAL10 | Aruncus allegheniensis Rydb. | Aruncus dioicus var. dioicus | Rosaceae
|