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Hypogymnia physodes (L.) Nyl. forme corticole

Synonyms:

Family: PARMELIACEAE

Habitat: Ubiquitous

Description

        Thallus foliose, forming rosettes not very adherent to the substrate, more or less regular 5-10 cm in its greatest length, formed of lobes deeply indented, hollow, convex, swollen, 1-3 mm in width, turned up at their apice, apices supporting lip-shaped farinose soralia, greenish-white, upper surface shiny, pale gray, pale bluish-gray, lower surface shiny, dark brown to blackish, more brownish towards the margin, smooth and without rhizines. Apothecia sparse, stipitate, 2-7 mm in diameter, disc brown-red, margin thin and persistent. Spores colorless, simple, very broadly elliptical, 6-9 x 4-5 µm. Pycnidia often numerous on the lobes, in particular towards the margin, in the form of non-protruding blackish dots (beware of Lichenoconium erodens frequent parasite of this very similar species but which is protruding and discolors the thallus on which it also gives large spots brownish to blackish necrosis). Photobiont: chlorococcoid. Cortex: K + yellow; medulla and soralia: C-, K-, KC + yellow then red, P + red-orange, UV purple. Species growing on the mossy bark of trunks and large branches where it is rarely fertile, see other forms below depending on the substrate. N.B. To be distinguished from Hypogymnia tubulosa, P- and with capitate and globular soralia and from Hypogymnia vittata more brownish and P-.


N.B. This ubiquitous species is very variable depending on its habitat and we can distinguish some forms, the corticolous form, here presented, being the most common, we can observe:

Hypogymnia physodes forme saxicole: pale greyish in dry weather, glaucous gray in wet weather, fairly common on the rocks of the heathlands, sometimes large, very rarely fertile.

Hypogymnia physodes forme lignicole: on wooden poles, dead trees, often  in large clumps.

Hypogymnia physodes forme ramicole: on canopy twigs, shrubs, heather, small and undeveloped thallus with relatively flat lobes.

Hypogymnia physodes forme des landes aérohalines: on the ground in low vegetation in Erica, Calluna, etc. very exposed and windy aerohaline heathlands.
 
Hypogymnia physodes forme pycnidiée: with abundant pycnidia, especially towards the end of the lobes.
 
 
 






Hypogymnia physodes forme corticole Crozon 1
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Cranou 1
Michel DAVID



Hypogymnia physodes forme corticole Locunolé 1
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Locunolé 2
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Corse Ospedale 1
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Corse Ospedale 2
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Corse Ospedale 3
Bernard BOUFFINIER



Hypogymnia physodes forme corticole Ardennes
Jacques HAINE



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