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Summary ~~
Acknowledgements '
Introduction ''
Material and Methods'
Herbaria '
Study and description of the samples
Nomenclature and citations '
Spore characters in the Caloplaca saxicola group '

Characters in the Caloplaca saxicola group and related species ~~
Thallus ''
Biological forms '
Surface ''
Types of plectenchyma
Cortex '
Epinecral layer
Cortex '
Medulla ''
Prothallus (= hypothalline line, hypothallus) '
Algal layer ''
Reproductive structures
Vegetative dispersion
Apothecia '
Pycnidia '
Chemistry '
Ecology and distribution
Habitat ''
Distribution ''

Key to the taxa and morphotypes of the Caloplaca saxicola group ~
Taxa of the Caloplaca saxicola group and related species '
The Caloplaca saxicola group ''
Caloplaca arnoldii (Wedd.) Zahlbr. '
Caloplaca arnoldii subsp. clauzadeana Gaya subsp. nova '
Caloplaca arnoldii subsp. nana Gaya subsp. nova''
Caloplaca arnoldii subsp. obliterata Gaya comb. nova '
Caloplaca arnoldii (Asiatic samples) ''
Caloplaca arnoldiiconfusa Gaya & Nav.-Ros. sp. nova ''
Caloplaca biatorina (A. Massal.) J. Steiner ''
Caloplaca decipiens (Arnold) Blomb. & Forssell ''
Caloplaca pseudofulgensia Gaya & Nav.-Ros. sp. nova'
Caloplaca pusilla (A. Massal.) Zahlbr. ''
Caloplaca rouxii Gaya, Nav.-Ros. & Llimona nom. nov. '
Caloplaca saxicola (Hoffm.) Nordin ''
Caloplaca schistidii (Anzi) Zahlbr. ''
Caloplaca biatorina subsp. gyalolechioides (M'll. Arg.)
Clauzade & Cl. Roux. '
Caloplaca saxicola subsp. laceratula (Arnold ex Poelt)
Clauzade & Cl. Roux ''
Other species closely related to the Caloplaca saxicola group '
Caloplaca alcarum Poelt ''
Caloplaca aurantia group ''
Caloplaca aegaea Sipman ''
Caloplaca aurantia (Pers.) Hellb. ''
Caloplaca flavescens (Huds.) J.R. Laundon
Caloplaca thallincola (Wedd.) Du Rietz '
Caloplaca ignea Arup '
Caloplaca scopularis (Nyl.) Lettau '
Lobed Caloplaca with soredia ''
Caloplaca cirrochroa (Ach.) Th. Fr. ''
Caloplaca obliterans (Nyl.) Blomb. & Forssell ''
Caloplaca proteus Poelt
Spore characters in the Caloplaca saxicola group
References
Iconography