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Verrucaria nigrescens Pers. var. nigrescens f. tectorum

Synonyms:

Family: VERRUCARIACEAE

Habitat: Ubiquitous

Description

    Differs from the type by its thallus, thinner, by the presence of isidia, all over areoles. N.B. This form seems to be differently analysed by British authors describing 'green blastidia' on thalli. Cf. often confused with Verrucaria macrostoma f. furfuracea that is sorediate towards areole margin, with a thicker thallus markedly turning to green when moist. Intermediate forms may be found and their identification is rather tedious.







Verrucaria nigrescens var. nigrescens f. tectorum Crozon 2
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 1
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 3
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 4
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 5
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 6
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 7
Michel DAVID



Verrucaria nigrescens var. nigrescens f. tectorum Crozon 8
Michel DAVID



Verrucaria nigrescens var. nigrescens forma tectorum Rostellec 1
Bernard BOUFFINIER



Verrucaria nigrescens var. nigrescens forma tectorum Rostellec 2
Bernard BOUFFINIER



Verrucaria nigrescens var. nigrescens forma tectorum Rostellec 3
Bernard BOUFFINIER



Verrucaria nigrescens var. nigrescens f. tectorum Landévennec 1
Bernard BOUFFINIER



Verrucaria nigrescens var. nigrescens f. tectorum Abrasé et humide Landévennec 2
Bernard BOUFFINIER



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