Paper: Cetrelia chemotypes are good species

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Neil Sanderson
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Paper: Cetrelia chemotypes are good species

Post by Neil Sanderson » Fri Oct 25, 2019 8:56 pm

I came across this paper, which is relevant to British field lichenology: https://doi.org/10.1016/j.funbio.2018.11.013, Mark et al (2019) Lichen chemistry is concordant with multilocus gene genealogy in the genus Cetrelia (Parmeliaceae, Ascomycota) Fungal Biology 123 125-139.

Analysing DNA sequences showed that definitions of species in Cetrelia purely by morphology i.e. Cetrelia olivetorum s. lat. soreidate, mainly sterile with mixed chemistry were polyphyletic, so not valid species, while definitions combining morphology and chemotypes produced monophyletic species. So the segregates of Cetrelia olivetorum s. lat. are good species (i.e. Cetrelia cetrarioides, Cetrelia olivetorum s. str., Cetrelia monachorum & Cetrelia chichitae), but Cetrelia olivetorum s. lat.is not.

Fortunately, although these species are critic morphologically they can easily be distinguished by spot tests and UV (from LGBI):

C. cetrarioides: medulla C–, K–, KC–, Pd–, UV+ blue-white (very very bight) (perlatolic acid), the most widespread species in Britain

C. olivetorum: s. str. medulla C+ pink to reddish, K–, KC+ red, Pd–, UV– (olivetoric acid), rarer than Cetrelia cetrarioides

C. monachorum: medulla C–, K–, KC–, Pd–, UV– (imbricaric acid), western Scotland and Ireland only so far

C. chichitae: medulla C–, K–, KC+ pink to red, Pd–, UV+ white (α-collatolic and alectoronic acids), rare.

All the best

Neil
Neil Sanderson

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