Verrucaria nigrescens f tectorum Verrucariaceae
Verrucaria nigrescens f. tectorum

Growth type crustose
Chemical results negative

Found in the same habitats as Verrucaria nigrescens f. nigrescens, probably widespread but very under-recorded

Differs from Verrucaria nigrescens f. nigrescens by the presence of green or olive-green blastidia that develop on the surface of the aureoles. The two forms are frequently found together



Verrucaria nigrescens f tectorum

Verrucaria nigrescens f tectorum

Verrucaria nigrescens f tectorum

Verrucaria nigrescens f tectorum
Verrucaria nigrescens f. tectorum
Steeple and Wareham, Dorset. February 2014, December 2016

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