John Walter Thomson

1913

• American Arctic lichens
• The lichen genus Cladonia in North America
• Agrestia cyphellata, a new genus and species of lichen in the Usneaceae
• Green power
• Haematomma lapponicum Räs. in North America
• Letharia californica is Letharia columbiana (Lichenes)
• Lichens of Arctic America
• Lichens of the 1951 foray to the north shore of Lake Superior
• Lichens of the Alaskan arctic slope
• Lichens of Wisconsin
• Modern species concepts
• Must the name Cladonia sylvatica (L.) Hoffm. be abandoned?