Juha Pykälä

Verrucaria vacillans is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is only known to occur in the Enontekiö Lapland region of northwestern Finland.

Verrucaria subdevergens is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It occurs in northeastern Finland.

Verrucaria kuusamoensis is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found within a small region of northeastern Finland.

Verrucaria fuscozonata is a rare species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is only known to occur in a single location in northeastern Finland.

Verrucaria difficilis is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in Finland.

Verrucaria cavernarum is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in Finland.

Verrucaria vitikainenii is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in Finland, where it occurs on calcareous rock outcrops.

Verrucaria oulankaensis is a rare species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in north-eastern Finland, where it occurs on calcareous rocks on river shores.

Verrucaria bifurcata is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in southern Finland.

Verrucaria ahtii is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. It is found in Finland, Lithuania, Russia, and Switzerland, where it occurs on calcareous pebbles.

Atla vitikainenii is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae. First described in 2016, it is characterised by its thin, variably coloured thallus and distinctive reproductive structures that are partially embedded in the lichen body. It appears to be a primarily northern species with a restricted distribution, having been documented from only four specimens found growing on dolomite surfaces in the Kilpisjärvi and Oulanka areas of northern Finland. The populations in the Oulanka area may represent relicts from earlier, colder climatic periods.

Atla tibelliorum is a rare species of saxicolous (rock-dwelling) in the family Verrucariaceae. First scientifically described in 2016, this crustose lichen is characterised by its pale ochre-coloured body that forms cracked patterns on its substrate, with distinctive reproductive structures embedded within warty protrusions. The species has a highly specialised habitat, occurring only in specific alpine and arctic environments with calcareous conditions, and has been documented in northwestern Finland and Alaska. This uncommon lichen represents one of several rare species found in Finland's

Atla oulankaensis is a rare species of saxicolous (rock-dwelling) lichen in the family Verrucariaceae. It has been recorded in Finland and in the Canadian arctic, growing on calciferous rock and on high-pH soil.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.

Visit the page for more details.