Ester Gaya:

Taxonomical revision of the Caloplaca saxicola group (Teloschistaceae, lichen-forming Ascomycota)

2009. 191 pages, 2 figures, 11 tables, 37 plates (5 colored), 14x23cm, 380 g
Language: English

(Bibliotheca Lichenologica, Band 101)

ISBN 978-3-443-58080-3, paperback, price: 73.00 €

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ascomycota fungi teloschistaceae caloplaca saxicola group


Synopsis top ↑

This volume presents a revision of the Caloplaca saxicola group (Teloschistaceae, Ascomycetes) of the northern Hemisphere. The revision is based on the study of morphological and anatomical characteristics of approximately 650 specimens and their relevant type material. The specimens and type material studied are documented in drawings of microscopic structures and photos of thallus habit and apothecia.

Furthermore the author presents a key to the taxa covered by this study. A statistical analysis was conducted to verify the significance of the spore characters for identification and completes this study.

As a result of this revision, the following taxa are now part of the C. saxicola group: Caloplaca arnoldii (Wedd.) Zahlbr.; C. arnoldii subsp. clauzadeana Gaya; C. arnoldii subsp. nana Gaya; C. arnoldii subsp. obliterata Gaya; C. arnoldiiconfusa Gaya & Nav.-Ros.; C. biatorina (A. Massal.) J. Steiner; C. decipiens (Arnold) Blomb. & Forssell; C. pseudofulgensia Gaya & Nav.-Ros.; C. pusilla (A. Massal.) Zahlbr.; C. rouxii Gaya, Nav.-Ros. & Llimona; C. saxicola (Hoffm.) Nordin; and C. schistidii (Anzi) Zahlbr.

Review: Nova Hedwigia vol. 90 1-2 (2010) top ↑

This contribution to the Bibliotheca Lichenologica series focuses on a widespread group of Calopaca species with placodioid thallus. The taxonomy of the genus Caloplaca is very complex and this revision tackles with a group of morphologically variable taxa. The book includes a revision of the species occurring in the Northern Hemisphere and is based on the morphological examination of ca. 650 specimens and the relevant type specimens. The author accepts nine species in the group and five subspecies. The number of accepted subspecies is unusual for lichenological treatments; the basic concept for the use of the subspecific rank is not discussed in detail here. All accepted taxa are described morphologically in detail and compared with similar taxa. Unfortunately, the secondary chemistry is not treated, but is said to be "not a good diagnostic character" in the group. Synonymy and nomenclature are discussed in detail and the discussion of each species follows modern standards. The citation of examined specimens is given in some length. In general, the layout of the book is not economic regarding space. There are numerous half-empty pages and the text could have been condensed in 150 pages without problems. This is not a criticism towards the author, but should be considered by the editors, especially given the relatively high costs of the issue. The literature is well discussed and the list of references includes most relevant literature. All species are also well illustrated with detailed drawings of anatomical details and habit photographs. This is certainly a very useful contribution to the taxonomy of this difficult group. I am curious to see molecular data confirming the taxonomic concepts of the author.

H.T. LUMBSCH, Chicago

Nova Hedwigia vol. 90 1-2 (2010)

Review: Bibliography of Systematic Mycology, 12(9), April 2010 top ↑

This is a technical revision of a small group of conspicuous but taxonomically obscure lichens, based on morphological and anatomical studies. Nine species (one of which has four subspecies) are accepted within the aggregate, with a further four treated in detail but excluded from the group. The study has clearly been meticulous, with around 650 specimens examined. Highly detailed accounts of the constituent taxa are presented, with critical components such as ascospore and spore septum dimensions being subjected to rigorous statistical analysis. The descriptions are models of their type. However, the technical terminology is (by some way) unnecessarily complex, leading to frequent consultation of the definitions section in the introductory part. I for one was lost in reading phrases such as ‘Parathecium ... with hyphae radially arranged, scleroprosoplectenchymatous of scleroplectenchymatous type B’.

I did feel that something was missing from this work. There is no formal definition of the Caloplaca saxicola ‘group’ itself. Its modern delimitation seems to be based primarily on molecular data (with references to one published paper and a further one in preparation). However, there is hardly a mention of these works apart from in the two-page introduction, no indication as to the close relatives and no linkages to the species and infraspecific taxa accounts. Why were the subspecies of C. arnoldii treated at this level and not given species status, for example? It is understandable that the publishers of phylogenetics research do not wish to present long lists of specimens examined, but the (presumably well-heeled) purchasers of this book deserve to see the full story. That apart, this small monograph will be a valuable technical resource, for the limited and still-contracting world community of systematic lichenologists.

Paul Cannon

Bibliography of Systematic Mycology, 12(9), April 2010

Review: Acta Botanica Hungarica 53 (3-4), 2011 top ↑

Though the genus Caloplaca was widely studied by several authors, some groups of it was still poorly understood when the author started to work on it. The Caloplaca saxicola group was revised in the Northern Hemisphere. Most of the species of this group have Holarctic distribution in xeric habitats on calcareous substrates. The traditional (more artificial, but practical) taxonomic treatment within Gasparrinia with the saxicolous, placodioid, lobed thalli containing anthraquinones was reconsidered according to the recent molecular phylogenetic results, and a restricted, more homogeneous, more natural species group was re-circumscribed. Macroscopical and microscopical investigations were carried out on 650 specimens of more than 20 herbaria, including the author’s own collections. The main characters involved in the study were thallus shape, surface, microscopical features of the layers, reproductive structures, chemistry (colour reactions only), ecology, and distribution.

As a result nine species (11 taxa) are kept in C. saxicola group with the description of two new species (C. arnoldiiconfusa Gaya et Nav.-Ros., C. pseudofulgensia Gaya et Nav.-Ros.) and two subspecies (C. arnoldii subsp. clauzadeana Gaya and C. arnoldii subsp. nana Gaya). The new name C. rouxii Gaya, Nav.-Ros. et Llimona was introduced and the C. arnoldii subsp. obliterata Gaya new combination was made. Four taxa were excluded (C. cirrochroa, C. saxicola subsp. laceratula, C. obliterans, C. proteus). Three species and a species group are closely related to the C. saxicola group. Three sorediate species with lobes are also characterised. The species and infraspecific taxa are included in the detailed key provided. The statistical analysis of the variables is found in the discussion.

Colour photographs and excellent drawings of ascospores, and details of thallus and fruit-bodies are illustrating the treated taxa.

As a whole it is a nice contribution to the knowledge of the C. saxicola group and related taxa.


Acta Botanica Hungarica 53 (3-4), 2011, p. 443

Table of Contents top ↑

Summary 5
Acknowledgements 6
Introduction 7
Material and Methods 10
Herbaria 10
Study and description of the samples 10
Nomenclature and citations 11
Spore characters in the Caloplaca saxicola group 11
Characters in the Caloplaca saxicola group and related species 14
Thallus 14
Biological forms 14
Surface 14
Types of plectenchyma 15
Cortex 16
Epinecral layer 16
Cortex 16
Medulla 16
Prothallus (= hypothalline line, hypothallus) 17
Algal layer 17
Reproductive structures 17
Vegetative dispersion 17
Apothecia 18
Pycnidia 20
Chemistry 21
Ecology and distribution 21
Habitat 22
Distribution 22
Key to the taxa and morphotypes of the Caloplaca saxicola group 23
Taxa of the Caloplaca saxicola group and related species 27
The Caloplaca saxicola group 27
Caloplaca arnoldii (Wedd.) Zahlbr. 27
Caloplaca arnoldii subsp. clauzadeana Gaya subsp. nova 33
Caloplaca arnoldii subsp. nana Gaya subsp. nova 36
Caloplaca arnoldii subsp. obliterata Gaya comb. nova 39
Caloplaca arnoldii (Asiatic samples) 52
Caloplaca arnoldiiconfusa Gaya & Nav.-Ros. sp. nova 54
Caloplaca biatorina (A. Massal.) J. Steiner 59
Caloplaca decipiens (Arnold) Blomb. & Forssell 66
Caloplaca pseudofulgensia Gaya & Nav.-Ros. sp. nova 69
Caloplaca pusilla (A. Massal.) Zahlbr. 73
Caloplaca rouxii Gaya, Nav.-Ros. & Llimona nom. nov. 82
Caloplaca saxicola (Hoffm.) Nordin 86
Caloplaca schistidii (Anzi) Zahlbr. 94
Caloplaca biatorina subsp. gyalolechioides (Müll. Arg.)
Clauzade & Cl. Roux. 97
Caloplaca saxicola subsp. laceratula (Arnold ex Poelt)
Clauzade & Cl. Roux 101
Other species closely related to the Caloplaca saxicola group 103
Caloplaca alcarum Poelt 103
Caloplaca aurantia group 108
Caloplaca aegaea Sipman 108
Caloplaca aurantia (Pers.) Hellb. 108
Caloplaca flavescens (Huds.) J.R. Laundon 109
Caloplaca thallincola (Wedd.) Du Rietz 110
Caloplaca ignea Arup 116
Caloplaca scopularis (Nyl.) Lettau 117
Lobed Caloplaca with soredia 122
Caloplaca cirrochroa (Ach.) Th. Fr. 122
Caloplaca obliterans (Nyl.) Blomb. & Forssell 122
Caloplaca proteus Poelt 123
Spore characters in the Caloplaca saxicola group 128
References 139
Iconography 147