Verrucaria squam3929b.jpg

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Verrucaria squamulosa, section through thallus, showing the presence of a thin black basal layer, composed of coarse paraplectenchyma, the rounded cells with carbonized walls. The presence of a dark basal layer is not mentioned in the type description but appears to be a consistent feature of this species.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith