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Umbilicaria freyi spec. nova und der Formenkreis von Umbilicaria hirsuta in Europa (Lichenes, Umbilicariaceae) / Umbilicaria freyi spec. nova and the Umbilicaria hirsuta agg. in Europe (Lichenes, Umbilicariaceae)

M. Codogno, J. Poelt and D. Puntillo
Plant Systematics and Evolution
Vol. 165, No. 1/2, Dedicated to Lothar Geitler on the occasion of his 90th birthday (1989), pp. 55-69
Published by: Springer
Stable URL: http://www.jstor.org/stable/23673898
Page Count: 15
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Umbilicaria freyi spec. nova und der Formenkreis von Umbilicaria hirsuta in Europa (Lichenes, Umbilicariaceae) / Umbilicaria freyi spec. nova and the Umbilicaria hirsuta agg. in Europe (Lichenes, Umbilicariaceae)
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Abstract

In Umbilicaria hirsuta and U. grisea the so-called soredia originate from structured plectenchyma of the upper thallus layer (thus contrasting with true soredia, which are pushed off from unstructured medullar plectenchyma), and, therefore, are termed parasoredia. Both species have been regarded to comprise (in western Europe) forms with relatively large thalli and a pale lower surface; rhizinomorphs may be present (with varying density) or absent; propagation is not by parasoredia, but by flattened diaspores (schizidia s. l.) These forms are united here and described as a separate species: U. freyi (syn. U. hirsuta var. pyrenaica Frey and U. grisea resp. murina f. subpapyria Frey). So far, the species is known to occur from the western Alps through C. France to the Pyrenees, C. Spain and Italy including Sardinia.

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