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Graphis Scripta 2: 1 55-1 50, 1 989<br />
Fdriindringar i utbredningsbilden hos Parmelia elegantula och<br />
Parmelia laciniarula i SkAne och Blekinge.<br />
Ame Thell, insdrutionen for systematisk botanik, 0 Va[gatan 20,223 61 Lund.<br />
Abstract<br />
The Swedish localities for Parmelia eleganrula (Zahlbr.) Szat. and Parmelia laciniatula (Oliv.) Zahlbr.<br />
wers outlined in denil by Almborn (1948) in a work on the distribution and ecology of some south<br />
Scandinavian lichens. In the summer of 1987, I revisited Ahnborn's renumerated localities in Sklne and<br />
Blekinge. Several new localiries were also registrated. Both species, as prcsumed, turned out to be less<br />
corrmon roday. They had vanished from about half of the visited localides. The number of localities in<br />
Sklne and Blekinge are 27 for Parmelia elegantula and about 60 for Parmelia laciniatulc. In 1948 the<br />
equivalent numbers were 34 respecdvely about 110. In addidon both could Presumably be found at more,<br />
for epiphytic lichens suitable habitats. Parmelia laciniatula doesn't occur in Blekinge or in the nonheast<br />
parts of SkAne. However, it's obviously nor rare in the south and the middle parts of Skllne. Parmelia<br />
elegantulc musr be rcgarded as an endangercd species as a whole whithin irs distributional range in south<br />
Scandinavia. Both spccies occur on bark of deciduous trees, prefcrably Acer, Fraxinus and Ulmus.<br />
Earlicr they were also common on Aesculus and Fagus, but now they are practicdly absent on these Eees.<br />
Another problem is rhe effecr of the reduced number of habin6, such as avenues. Parmelia elegantula as<br />
well as p. Iaciniatula prcfer rrecs in open places with supply on dust rich in nutriment. Climatic faciors, can<br />
also be delimiting for these mainly temperate species.<br />
Inledning<br />
Detta arbete har ingatt i ett storre projekt: Hotade lavar i siidra sverige, vid<br />
institutionen for systemarisk botanik vid Lunds universitet med ekonomiskt st6d frAn<br />
viirldsnarurfonOen, WWF. Projektet var frAn b0rjan fr[mst inriktat pA att studera<br />
nuvarande status for de 24 sydliga arter som finns rePresenterade i Almborns<br />
avhandling frAn 1948. Numera ingAr alla hotade arter i undersdkningen. Inom detta<br />
projekt uuld. jag som tilliimpningsarbete att specialstudera utbredningen av Parmelia<br />
,triorruta (Zahlbr.) Szat. och Parmelia eleganruta (OIiv.) Zahlbr i SkAne och Blekinge.<br />
Det iir nu over 40 Ar sedan Ove Almborn (1948) publicerade sin avhandling<br />
Distribution and Ecology of Some South Scandinavian Lichens' Arbetet<br />
omfattade utbredning och .<br />
,ekologi for 24 sydliga lavarter .samt noggranna<br />
lokalbeskrivnin gar. SJAan dess har inget civergripande arbete 6ver sodra Sveriges<br />
lavflora publiceiars. Det iir emellertid ualkant, att detta omrlde varit speciellt utsatt for<br />
luftfciroreningar och landskapsfdrlindringar. Effekterna av detta har p[verkal lavfloran.<br />
Vissa epifytiska arrer lir speciett k[nsliga fdr luftfororeningar medan andra troligen<br />
rrlngrs tiilbatca av det moderna lantbruket. Fcir utprlglat sydliga arter iir<br />
klimadluktuationer sannolikt ocksA en faktor att riikna med.<br />
parmelia elegantula, som beskrevs som slllsynt, insamlades for f6rsta glngen i<br />
Sverige 1929. Almborn (1948) angav 45 lokaler for Sverige, varav ett tiotal lAg utanfor<br />
Sken; och Blekinge inom ert begrlinsat omrAde vid v[stkusten (fig. 1). Fdrktaringen till<br />
denna isolerade forekomst ansAgs vara klimatologisk Vad som hlint inom dena omrAde<br />
iir itnnu okiint och borde kunna bli foremAl f6r en fortsan unders0kning.<br />
Parmelia laciniatula insamlades fdr fcirsta gAngen 1933. Antalet kiinda lokaler steg
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