PLACODIOID TAXA OF LECANORACEAE SENSU ZAHLBR. (LICHENIZED ASCOMYCOTINA) IN NORTH-AMERICA - TAXA EXCLUDED FROM LECANORA SUBG. PLACODIUM

Authors
Citation
Bd. Ryan et Th. Nash, PLACODIOID TAXA OF LECANORACEAE SENSU ZAHLBR. (LICHENIZED ASCOMYCOTINA) IN NORTH-AMERICA - TAXA EXCLUDED FROM LECANORA SUBG. PLACODIUM, Nova Hedwigia, 64(3-4), 1997, pp. 393-420
Citations number
111
Categorie Soggetti
Plant Sciences
Journal title
ISSN journal
00295035
Volume
64
Issue
3-4
Year of publication
1997
Pages
393 - 420
Database
ISI
SICI code
0029-5035(1997)64:3-4<393:PTOLSZ>2.0.ZU;2-2
Abstract
This article presents a key to the placodioid (rosulate to lobate, squ amulose, umbilicate, or dwarf fruticose) taxa of Lecanoraceae sensu Za hlbr. in North America; and gives an overview of their systematics and nomenclature, emphasizing the ones presently excluded from Lecanora s ubg. Placodium sensu Poelt, especially Rhizoplaca Zopf s.l., Squamarin a Poelt, and Solenopsora Massal. The Rhizoplaca melanophthalma and R. chrysoleuca/R. subdiscrepans complexes are extremely problematic. Squa marina and Solenopsora are very different from each other, and probabl y do not belong in the same family. Lobothallia (Clauz. & Roux) Hafell ner, Arctopeltis Poelt and Protoparmelia M. Choisy, ''Lecanora'' pring lei and similar taxa, and ''Lecanora'' demissa are treated briefly. So me comments are also made on the systematics and nomenclature of the L ecanoraceae, and the genus Lecanora and its subgenera.