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 Add this item to the list   Cercidospora thamnoliae

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 Summary:Cercidospora thamnoliae Zhurb., The Lichenologist 44: 153 (2011) [MB#563052] 
 MycoBank #:563052 
 Authors (abbreviated):Zhurb.
 Page #:153
 Year of publication:2011
 Name type:Basionym 
 Date public:2012-02-10 09:47:23 
 Name status:Legitimate
 Remarks:Notes. The following eight previously described Cercidospora species regularly have ascospores with three or more septa: C. alpina Ihlen & Wedin (on Stereocaulon), C. cladoniicola (on Cladonia), C. decolorella (Nyl.) O.E. Erikss. & J.Z. Yue (on terricolous algal films, Mycobilimbia, Peltigera, Protopannaria, Solorina), C. ochrolechiae Zhurb. (on Ochrolechia, Pertusaria), C. pluriseptata (Nyl.) Zopf (on Lecanora), C. punctillata (on Biatora, Buellia, Cladonia, Lecanora, Micarea, Mycobilimbia, Peltigera, Phaeorrhiza, Pilophorus, Protopannaria, Psoroma, Solorina, Sphaerophorus), C. soror Obermayer & Triebel (on Arthrorhaphis), C. stereocaulorum (on Stereocaulon) (Nylander 1866; Alstrup et al. 1994; Hafellner & Obermayer 1995; Zhurbenko et al. 1995; Zhurbenko & Santesson 1996; Alstrup 1997; Zhurbenko 2002, 2008, 2009a, b, 2010b; Zhurbenko & Alstrup 2004; Zhurbenko & Triebel 2005; Ihlen & Wedin 2007; Brackel 2010a; specimens of Cercidospora punctillata examined for comparison). Cercidospora alpina differs from C. thamnoliae in its much bigger(200-350 µm diam.) semi-immersed ascomata and longer ascospores [(18-)19.5-33(-43) × (4-)4.5-6.5(-7.0) µm] with up to 7 septa; C. decolorella has somewhat bigger ascomata (100-250 µm diam.) and ascospores often with 4-5 septa; C. cladoniicola readily differs in its olive-brown exciple; C. ochrolechiae is most similar to the new species, but differs from the latter mainly in the occasional presence of 5-septate ascospores; C. pluriseptata has a brown exciple and ascospores with up to 7 septa; C. punctillata differs in its somewhat bigger and markedly erumpent ascomata, bigger ascospores [(14-)18.5-25(-33) × (4-)4.5-6.5(-9) µm] with (1-)3-5(-6) septa, and distinct pathogenicity; C. soror readily differs in its (2-)4-spored asci; C. stereocaulorum has bigger, sometimes almost superficial ascomata [100-200(-300) µm diam.], (2-)4(-8)-spored asci, and bigger ascospores [(13-)18.5-25.5(-30) × (4-)5-7(-8) µm] with up to 6 septa. Additionally all these species grow on different host genera. The comparison with C. thamnoliicola, which also has many 3-septate ascospores is provided in Table 1.
Such features as markedly exposed ascomata of more than 150 µm diam., the occurrence of 4-septate ascospores and the clear bleaching of host tissues were observed only in LE 260528; its inclusion significantly broadened the new species concept. That deviating sample resembles some specimens of Cercidospora punctillata agg. (which thus might be the fifth Cercidospora species on Thamnolia). However, the latter species is the only one in the genus with an extremely wide host range, which suggests that it might be heterogenous. It is noteworthy that 20 of 27 Cercidospora species are confined to one host genus, the exceptions being, apart from C. punctillata [syn. C. decolorella var. lichenicola (Zopf) O.E. Erikss. & J.Z. Yue], C. decolorella (actually indistinguishable from the latter), C. caudata, C. galligena, C. ochrolechiae, C. solearispora, and C. werneri Nav.-Ros., Calat. & Hafellner. Another consideration is that in LE 260528 Cercidospora thamnoliae grew on an abnormally robust host thallus, which might be the reason of developing comparatively big and exposed ascomata. Further materials are needed to confirm the suggested broad species concept or make it more narrow.
Examined specimens of Cercidospora thamnoliae also fit the protologue of C. lecidomae, the species which was distinguished from the earlier described C. punctillata mainly by its smaller and less septate ascospores (Zhurbenko & Triebel 2003). However, careful comparison of additional material of Cercidospora lecidomae with C. punctillata revealed that ascospores of both species are (1-)3-5(-6)-septate and almost indistinguishable by size: (15-)18.5-27(-35.5) × (4.5-)5-6.5(-8) µm (n = 92) vs. (14-)18.5-25(-33) × (4-)4.5-6.5(-9) µm (n = 479). No additional discriminating characters between the species were found. As a consequence Cercidospora lecidomae Zhurb. & Triebel, Bibliotheca Lichenologica 86: 206 is reduced here to synonymy (syn. nov.) with Cercidospora punctillata (Nyl.) R. Sant., Santesson et al., Lichen-Forming and Lichenicolous Fungi of Fennoscandia: 82 (2004); basionym: Verrucaria punctillata Nyl., Flora 67: 223 (1884). Cercidospora lecidomae has been reported on Thamnolia vermicularis by Kukwa & Flakus (2009). Although I did not examine this material, it is likely to belong to Cercidospora thamnoliae.

Distribution and host. Known from polar desert and arctic tundra of the American and Russian Arctic. Mostly found on old or decaying thalli of Thamnolia vermicularis, sometimes possibly causing local bleaching of host tissues (their distinct discoloration was observed only in LE 260528).
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