<abstract xmlns="http://www.w3.org/1999/xhtml">

128 species in 45 genera of sorediate and isidiate, crustose, corticolous lichens are recorded from Norway. Accounts of their morphology, chemistry, and substratum preferences are presented, and a discussion of their distribution in Norway is supported by maps for a number of taxa. With few exceptions, the taxa can be distinguished on thallus characters alone. Several taxa, especially those with brown or blue-pigmented soralia, have soredia with a distinct cortex. New species are: <italic>Buellia arborea</italic> Coppins &amp; Tønsb. (from Norway and Scotland), <italic>Fuscidea arboricola</italic> Coppins &amp; Tønsb. (from Norway, Sweden, and Scotland), <italic>F. pusilla</italic> Tønsb. (from Norway, Sweden, and Scotland), <italic>Lecanora flavoleprosa</italic> Tønsb. (from Norway and Austria), <italic>L. flavopunctata</italic> Tønsb. (from Norway and Sweden), <italic>L. norvegica</italic> Tønsb. (from Norway), <italic>Lecidea gyrophorica</italic> Tønsb. (syn. <italic>L. epizanthoidiza</italic> auct., non Nyl.), <italic>L. praetermissa</italic> Tønsb. (from Norway and Sweden), <italic>L. subcinnabarina</italic> Tønsb. (from Norway), <italic>L. vacciniicola</italic> Tønsb. (from Norway, Sweden, and Spain), <italic>Lecidella subviridis</italic> Tønsb. (from Norway and Sweden), <italic>Lepraria elobata</italic> Tønsb. (from Norway), <italic>L. jackii</italic> Tønsb. (from Norway), <italic>L. obtusatica</italic> Tønsb. (from Norway), <italic>L. umbricola</italic> Tønsb. (from Norway, England, and Scotland), <italic>Micarea coppinsii</italic> Tønsb. (from Norway and Scotland), <italic>Rinodinaflavosoralifera</italic> Tønsb. (from Norway), <italic>R. disjuncta</italic> Sheard &amp; Tønsb. (from Norway and the pacific coast of U.S.A. and Canada), and <italic>Schaereria corticola</italic> Muhr &amp; Tønsb. (from Norway, Sweden and Scotland). <italic>Ochrolechia androgyna</italic> s. lat. is shown to comprise at least four distinct species.
New combinations are: <italic>Cliostomum leprosum</italic> (Räsänen) Holien &amp; Tønsb., <italic>Lepraria rigidula</italic> (B. de Lesd.) Tønsb., <italic>Mycoblastus caesius</italic> (Coppins &amp; P. James) Tønsb., <italic>Placynthiella dasaea</italic> (Stirton) Tønsb., and <italic>Ropalospora viridis</italic> (Tønsb.) Tønsb. <italic>Lecidea turgidula</italic> var. <italic>pulveracea</italic> Fr. is raised to specific level with the new name <italic>Lecidea leprarioides</italic> Tønsb. <italic>Mycoblastus sterilis</italic> Coppins &amp; P. James is reduced to synonymy with <italic>M. fucatus</italic> Stirton.
<italic>Pertusaria borealis</italic> is new to Europe. <italic>Halecania viridescens, Lecanora farinaria, Lepraria caesioalba</italic> Laundon ined., <italic>L. eburnea</italic> Laundon ined., <italic>Megalospora tuberculosa, Opegrapha multipuncta,</italic> and <italic>Scoliciosporum gallurae</italic> are new to Scandinavia. <italic>Mycoblastus caesius, Lecidella elaeochroma</italic> “f. <italic>soralifera”, L. flavosorediata, Micarea granulans</italic> (saxicolous, not treated), <italic>Opegrapha sorediifera,</italic> and <italic>Rinodina degeliana</italic> are new to Norway.
In some cases, Poelt’s species pair concept can be applied to this group of lichens. Additional secondary substances, not occurring in the primary species, sometimes occur in the soralia of the secondary species. In this case, presence of the additional substance cannot be regarded as an independent taxonomic character, and the species pair concept is still useful. However, morphologically indistinguishable specimens with different chemistry may represent different secondary species.
The term consoredia is introduced to denote diaspores composed of aggregated soredia.
</abstract>

The sorediate and isidiate, corticolous, crustose lichens in Norway

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The sorediate and isidiate, corticolous, crustose lichens in Norway

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