Corticolous Sorediate Lecanora Species (Lecanoraceae, Ascomycota) Containing Atranorin in Europe
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The Lichenologist 49(5): 431–455 (2017) © British Lichen Society, 2017 doi:10.1017/S002428291700038X Corticolous sorediate Lecanora species (Lecanoraceae, Ascomycota) containing atranorin in Europe Jiří MALÍČEK, Franz BERGER, Zdeněk PALICE and Jan VONDRÁK Abstract: Sixteen sorediate epiphytic species of Lecanora with atranorin from Europe are reported here. Lecanora substerilis is described as a new species from Carpathian beech forests in the Czech Republic, Slovakia, Romania and Ukraine; it belongs to the L. subfusca group in its strict sense and is characterized by its usually verrucose thallus, sorediate apothecial margin, epihymenium with coarse granules at paraphyses tips, amphithecium with large crystals and it produces atranorin and fatty acid(s). A new, yellow chemotype of L. barkmaniana containing pulvinic acid derivatives is recognized from Austria. Morphological, ecological and chemical variation in L. exspersa, L. farinaria and L. variolascens is discussed in detail, and brief comments on the remaining 11 species are provided. Evaluation of the type material and molecular data indicate that the predominantly saxicolous L. caesiosora is a sorediate form of L. cenisia. Molecular data confirmed the identities of the sorediate forms of L. albella and L. allophana that are conspecific with their fertile counterparts. New Central European localities are listed for the rare species, L. barkmaniana, L. exspersa, L. mughosphagneti, L. norvegica and L. variolascens. Positions in ITS and mtSSU phylogenies are outlined for most species. Identification keys to fertile as well as sterile populations are provided. Key words: epiphytic lichens, Lecanora subfusca group, Lecanora substerilis, old-growth beech forests, pulvinic acid Accepted for publication 12 March 2017 Introduction L. exspersa, L. impudens) to those covering almost the entire thallus (e.g. L. barkmaniana, Members of the genus Lecanora, as currently L. thysanophora). It is difficult to identify many recognized, are mainly characterized by their predominantly sterile species and thus chemo- lecanorine apothecia and a crustose or rarely taxonomic methods, mainly spot tests or thin- placodioid thallus. Sexual reproduction layer chromatography, are necessary for their predominates but vegetative reproduction correct identification (e.g. Brodo et al. 1994; by soredia is also quite common. Sorediate Malíček 2014; Zduńczyk & Kukwa 2014). European species usually have a crustose This study focuses on sorediate taxa thallus; leprose (e.g. L. expallens, L. rouxii)and occurring on tree bark or wood which con- placodioid (only in saxicolous L. lisbonensis tain atranorin and/or chloratranorin as a and L. lojkaeana) growth forms are rare. major secondary metabolite. Some sterile Soralia vary from small delimited ones (e.g. specimens cannot be unambiguously identi- fied without DNA sequence data due to the J. Malíček and Z. Palice: Institute of Botany, Academy large within-species variabilities and a limited of Sciences of the Czech Republic, Zámek 1, 252 43 number of phenotypic characters. In con- Průhonice, Czech Republic; and Department of trast, our sequence data of mtSSU and ITS Botany, Faculty of Sciences, Charles University in Prague, Benátská 2, CZ-128 01, Prague 2. Email: loci did not distinguish some closely related [email protected] species that we still regard as ‘good species’ F. Berger: Raiffeisenweg 130, A 4794 Kopfing, Austria. with respect to their differences in anatomical, J. Vondrák: Institute of Botany, Academy of Sciences chemical and ecological characters. ů of the Czech Republic, Zámek 1, 252 43 Pr honice; During our research on forest lichen and Department of Botany, Faculty of Biological Sci- ences, University of South Bohemia, Branišovská 31, diversity in Central Europe in recent years, 370 05 České Budějovice, Czech Republic. several unidentified sorediate crusts have Downloaded from https://www.cambridge.org/core. IP address: 37.221.244.57, on 19 Sep 2017 at 11:32:13, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/S002428291700038X 432 THE LICHENOLOGIST Vol. 49 been collected, some of which could belong quick isolations of non-problematic loci, for example to new taxa of Lecanora or to new chemotypes nrITS and mtSSU regions in some richly fertile taxa (e.g. with gangaleoidin) of already known (L. argentata, L. chlarotera) or very fresh material. There- after, Invisorb Spin Plant Mini Kit (Invitek) and CTAB species. One crust collected at several local- protocol (Cubero et al. 1999) were used with better results. ities, which was proved by DNA sequence The fungal nuclear ITS region and mitochondrial SSU data to be Lecanora, was distinctive and is were amplified with the following primers: ITS1F (Gardes described here as new. Five other taxa are & Bruns 1993) and ITS4 (White et al. 1990), mrSSU1, fl mrSSU2 and mrSSU3R (Zoller et al. 1999). We also treated in detail, the others are brie y com- tested nuclear IGS, Mcm7, LSU, SSU and protein-coding mented upon. Identification keys (for speci- β-tubulin, RPB2 and TEF; these were used mainly in mens with apothecia and for sterile problematic sterile samples where no or only one-locus specimens) to all 16 species known from data were available. However, the amplification was Europe are provided. Generally, this group of unsuccessful in almost all cases. fi PCR reactions of nrITS and mtSSU were prepared for lichens is taxonomically very dif cult, and a20µl final volume containing 14 µl of double-distilled detailed TLC and DNA analyses are recom- water, 4 µl MyTaq polymerase reaction buffer, 0·2 µl mended for correct identifications. MyTaq DNA polymerase, 0·4 µl of each of the 25 mM primers and 1 µl of the sample. Amplifications of both loci consisted of an initial 1 min denaturation at Material and Methods 95 °C, followed by 35 cycles of 1 min at 95 °C, 1 min at 55–56 °C, 1 min at 72 °C, and a final extension of 7 min This study is based on material collected by the authors fi · and deposited either in private or public herbaria (FB: hb. at 72 °C. The PCR products were quanti ed on a 0 8% F. Berger, JM: hb. J. Malíček, PRA). In addition, other agarose gel stained with ethidium bromide and cleaned specimens, including type material, were studied in B, BG, with GenElute PCR Clean-Up Kit (Sigma), according to the manufacturer’s protocols, or with the sodium BM, BRA, E (collections of B. J. Coppins), GZU, H, L, fi M, PRA (collections of Z. Palice and J. Vondrák), PRA-V, acetate/ethanol puri cation method. In total, 30 new S, SZU and UPS. Type material of Lecanora farinaria and nuclear ITS and 60 mtSSU sequences were generated L. inversa was examined only via JStor Global Plants. (Table 1). Unfortunately, we were unable to obtain sequences from five species due to the lack of fresh material Anatomical and chemical examination (L. viridissima, epiphytic L. cenisia f. soredians) and difficulties with gene amplification (L. jamesii, Microscopic descriptions are based on hand-cut L. mughosphagneti, L. norvegica). Acquiring sequences of sections mounted in water. The solubility of epihymenial many sterile species was very problematic and often had crystals was studied in 50% HNO . The amphithecium 3 limited success. For example, the ITS region from and apothecial cortex were observed in KOH. Crystals and L. impudens, L. thysanophora and L. allophana f. sorediata granules in apothecia were observed in polarized light was unsuccessfully amplified in all attempts, despite (POL). For the terminology of anatomical characters, the employing various troubleshooting methods (touch- work of Brodo (1984) was followed. Thin-layer chroma- down PCR, nested PCR, tuning PCR settings, applica- tography (TLC), with a few minor modifications, followed tion of specific primers etc.). It was also necessary to use the methods of Orange et al. (2010). Lichen compounds only a short mtSSU region (SSU2 × SSU3R) of c. 400 were applied on a set of three glass plates and placed into BP in many cases because it had higher efficiency than a A, B' and C solvents. The distance between starting and long one (SSU1 × SSU3R) of c. 700 BP. Some species finishing lines was c. 100 mm. Two or three drops (L. allophana f. sorediata, L. farinaria) are represented (according to the quantity of tested material) of acetone only by one or two sequences due to a limited amount were added to each test tube. Fatty acids were detected by of fresh material and the amplification problems dipping each of these plates into water tanks. Chlora- discussed above. tranorin was not distinguished from atranorin by TLC; their mutual presence is constant in all involved species but this is not repeated in species descriptions. Five samples Alignment and phylogenetic analysis extracted in methanol were analyzed by LC-MS (liquid chromatography and mass spectrometry), following the Sequences were edited in BioEdit 7.2.5 free methods of Valný et al. (2016) with a few modifications: the software (Hall 1999) and then aligned by the online analyses were performed under a linear gradient program application MAFFT version 7 (Katoh & Standley · · · 2013) with L-INS-i method (Katoh et al. 2005). The (min/%B) 0/5, 1 5/5, 12 5/58 followed by a 1 5-min fi column clean-up (100% B) and 1·5 min equilibration alignments were manually revised. The nal ITS align- (5% B). The total analysis time was 20 min. ment contained 613 positions and 48 sequences; the mtSSU alignment had 895 positions and 70 sequences. DNA extraction, amplification and sequencing Gaps were coded in SeqState by simple coding (Simmons & Ochoterena 2000). Molecular phylogenies Initially, simple NaOH extraction (Werner et al. 2002) were reconstructed by Bayesian inference as incorporated was used for DNA isolations. This is recommended for in MrBayes 3.1.2 (Huelsenbeck & Ronquist 2001; Downloaded from https://www.cambridge.org/core. IP address: 37.221.244.57, on 19 Sep 2017 at 11:32:13, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms.