<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <TITLE>Caloplaca citrina (images of British lichens)</TITLE> <META NAME="description" CONTENT="Photographs of Caloplaca citrina (lichen)"> <META NAME="keywords" CONTENT="image, images, photograph, lichen, Caloplaca, austrocitrina, millipede"> <META NAME="Author" CONTENT="Alan J. Silverside"> </HEAD> <BODY bgcolor="#000000" background="Icback_dr.jpg" TEXT="#000000" LINK="#3672a4" VLINK="#3672a4"> &nbsp; <center><table border=0 bgcolor="#ffffff" width=1000> <tr><td> <a href="Caloplaca_cirrochroa.html" target="_top"><img src="previous.gif" border=0 alt="Previous page" align=left></a> <a href="Caloplaca_crenularia.html" target="_top"><img src="next.gif" border=0 alt="Next page" align=right></a> <blockquote> <h5 align=center><font color="#b22222" face="arial">&nbsp;<br>lastdragon.org</font></h5> <h2 align=center><font color="#b22222">Images of British Lichens</font></h2> <hr width="50%"> <p><br></p> <center> <p><font size=5><b>Caloplaca &quot;citrina&quot;</b></font><font size=4> <i>auct. Brit.</i>, name misapplied<br>&nbsp;<br><b>Caloplaca aff. austrocitrina</b> Vondr&aacute;k, Xha, Arup &amp; S&oslash;chting</font></p> <p><br></p> <table width=740 border=0> <tr><td><div align=justify><font face="arial" size=2>Thallus bright to chrome yellow, forming an irregular, areolate crust, areoles sorediate over much of their surface; apothecia with sorediate margins. Apparently common throughout Britain, including urban areas, on rocks, walls and other artificial substrates such as metal fences. Probably the commonest of a complex of species that includes <i>C. limonia</i> (page pending), <i><a href="Caloplaca_arcis.html">C.&nbsp;arcis</a></i>, <i>C.&nbsp;dichroa</i> (page pending) and <i><a href="Caloplaca_flavocitrina.html">C.&nbsp;flavocitrina</a></i>.</p> <p>Refs (for <i>C. citrina</i>, s.l., probably including <i>C</i>. aff. <i>austrocitrina</i>): Arup (2006) (photo); Wilk (2012), 23 (photo), 59-61; Smith <i>et al</i>. (2009), 259; Purvis <i>et al.</i> (1992), 149; Dobson (2011), 108 (photo); Jahns (1983), 246-247 (photo); Whelan (2011), 58 (photo); van Herk &amp; Aptroot (2004, 2013), 90-1 (photo); Thomson (1997), 155; Lichen Atlas of the British Isles 6: 247 (2001). &nbsp;N.B., the brighter orange taxon illustrated in Dobson (2005) under this name is <i>C.&nbsp;dichroa</i>, <i>fide</i> Fletcher &amp; Laundon in Smith <i>et al</i> (<i>op. cit.</i>).</p> <p>Refs. for <i>C.&nbsp;austrocitrina</i>: Vondr&aacute;k <i>et al.</i> (2009), 587 (photo), 588; Wirth, Hauck &amp; Schulz (2013), 1: 287, 294 (photo, but see below).</p> <p>Recent work (see Powell &amp; Vondr&aacute;k (2011), <i>British Lichen Society Bulletin</i> 109: 25&ndash;27, and (2012), <i>British Lichen Society Bulletin</i> 110: 20&ndash;24) has shown that this widespread, typically chrome-yellow species that has been called &quot;<i>C.&nbsp;citrina</i>&quot; is not that species, and it is currently doubtful that true <i>C.&nbsp;citrina</i> occurs in Britain. The identity of British &quot;<i>citrina</i>&quot; is uncertain, but molecular work has shown it matches or is closely related to <i>C.&nbsp;austrocitrina</i>, recently described and known in central and eastern Europe. The photograph of <i>C.&nbsp;austrocitrina</i> in Wirth, Hauck &amp; Schulz (2013) shows a <i>Caloplaca</i> with sorediate-margined apothecia, but the areoles are rather convex and sorediate initially at the margins.</p> <p>FGBI: <a href="http://fungi.myspecies.info/all-fungi/caloplaca-citrina" target="_blank">http://fungi.myspecies.info/all-fungi/caloplaca-citrina</a></p> <p>If anyone can identify the millipede, please let me know.</font></div></td></tr> </table> &nbsp; <table> <tr><td align=center><img src="Caloplaca_citrina.jpg" border=1 vspace=5 alt="Caloplaca citrina"></td></tr> <tr><td align=center><img src="Caloplaca_citrina_cu.jpg" border=1 vspace=5 alt="Caloplaca citrina, closer view"></td></tr> <tr><td align=center><img src="Caloplaca_citrina_+_millipede.jpg" border=1 vspace=5 alt="millipede on Caloplaca citrina"></td></tr> <tr><td align=center><font face="arial" size=2>Coastal rocks, Arbroath, Angus, April 2002</font></td></tr> </table> <p><br></p> <table border=0> <tr><td><a href="Caloplaca_cirrochroa.html" target="_top"><img src="baru6.gif" border=0 alt="Previous page"></a></td> <td width="50">&nbsp;</td> <td><a href="Caloplaca_crenularia.html" target="_top"><img src="baru8.gif" border=0 alt="Next page"></a></td></tr> </table> </center> <p><br></p> <p><hr></p> <center><font face="Arial" size=2> <p><b><a href="index.html" target="_top">Lichens HOME PAGE</a> | <a href="indexP.html" target="_top">Index of Species</a> | <a href="http://www.lastdragon.org/conditions.html" target="_top">Conditions of Use and e-mail contact</a> | <a href="references.html" target="_top">References</a> | <a href="http://www.lastdragon.org/home.html" target="_top">Site Home Page</a></b></p> </font></center> <p><br></p> <font face="Arial" size=2> <p>&copy; A.J. Silverside<br> Uploaded March 2008, last updated January 2016 (first hosted at www-biol.paisley.ac.uk, January 2003)</p> </font> </blockquote> </td></tr> </table></center> </BODY> </HTML>