ABSTRACT: On the basis of our molecular phylogenetic results we propose that specific and infraspecific epithets currently placed in the segregate genus Cladina be transferred to the genus Cladonia, and that Cladina become a synonym of Cladonia. Of the almost 50 species and infraspecific taxa currently recognized as accepted names, we have identified 14 epithets at specific or infraspecific ranks that require transfer into the genus Cladonia. Of these, eight have never been placed in the genus, and six have not been recognized at their proposed rank and position in Cladonia. In addition, the author citation of the name Cladina mitis is corrected.

KEYWORDS: Lichen-forming fungi, Lecanoromycetes, Lecanorales, nomenclature

NOMENCLATURAL NOVELTIES:
Cladonia arbuscula (Wallr.) Flot. subsp. boliviana (Ahti) Ahti & DePriest, p. 500
Cladonia arbuscula (Wallr.) Flot. subsp. imshaugii (Ahti) Ahti & DePriest, p. 500
Cladonia arbuscula (Wallr.) Flot. subsp. pachyderma (Ahti) Ahti & DePriest, p. 501
Cladonia argentea (Ahti) Ahti & DePriest, p. 501
Cladonia atrans (Ahti) Ahti & DePriest, p. 501
Cladonia ciliata Stirt. f. flavicans (Flörke) Ahti & DePriest, p. 501
Cladonia confusa R. Sant. f. bicolor (Müll.Arg.) Ahti & DePriest, p. 501
Cladonia densissima (Ahti) Ahti & DePriest, p. 501
Cladonia densissima (Ahti) Ahti & DePriest f. decolorans (Ahti) Ahti & DePriest, p. 501
Cladonia halei (Ahti) Ahti & DePriest, p. 501
Cladonia kalbii (Ahti) Ahti & DePriest, p. 501
Cladonia kriegeri (Ahti & S.Stenroos) Ahti & DePriest, p. 501
Cladonia pycnoclada (Pers.) Nyl. f. fuscescens (Ahti) Ahti & DePriest, p. 501
Cladonia rangiferina (L.) F.H.Wigg. subsp. abbayesii (Ahti) Ahti & DePriest, p. 501