Leena Kaarina Myllys

Gowardia is a genus of medium-sized, greyish hair lichens in the family Parmeliaceae. It is a circumpolar genus, mainly restricted to arctic-alpine habitats in northern Canada, Europe, and Russia.

Gowardia nigricans, commonly known as the gray hair lichen or gray witch's hair, is a species of fruticose lichen in the family Parmeliaceae.

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.

Sulcaria spiralifera is a species of fruticose lichen in the family Parmeliaceae. First described in 1977 as a species of Bryoria, it was transferred to the genus Sulcaria in 2014 based on DNA analysis. The species comprises two chemical variants now recognized as varieties: the typical variety and var. pseudocapillaris, which differ in their chemical composition and spot test reactions. It is found in the northwestern United States, where it grows as an epiphyte, hanging from a variety of tree species in open or shaded maritime forests. The lichen is characterized by its pendulous brown

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.

Micarea fennica is a species of lichen in the family Ectolechiaceae. Originally found in Finland, it was formally described as a new species in 2019 by lichenogists Annina Launis and Leena Myllis. The type specimen was discovered in an old growth forest in Kalajanvuori, Rautalampi, (Pohjois-Häme, Finland). Here it was found growing on the softened wood of a standing dead Pinus sylvestris, along with Micarea prasina.

Gowardia arctica is a species of terricolous (ground-dwelling), fruticose (bushy) lichen in the family Parmeliaceae. Found in arctic regions of Northern Canada and Russia, it was formally described as a new species in 2009 by Pekka Halonen, Leena Myllys, Saara Velmala, and Heini Hyvärinen. The type specimen was collected from Banks Island in Swan Lake (Inuvialuit, Northwest Territories); here, at an elevation of 100 m (330 ft), it was found growing among mesic mountain heath. It also occurs along the Arctic Ocean coast (and associated islands) of Russia. The lichen is richly branched, black

Bryoria kockiana (Kock's horsehair lichen) is a species of horsehair lichen in the family Parmeliaceae. It is found in North America, where it grows from the branches of conifer trees.

Bryoria irwinii is a species of horsehair lichen in the family Parmeliaceae. The species is endemic to coastal northwestern North America, with a range extending from central British Columbia to southeastern Alaska. Unlike some widespread members of the genus, B. irwinii has a relatively restricted geographic distribution, being found only in cool, hypermaritime regions where it grows primarily on conifer trunks and branches, especially those of Pinus species in well-ventilated locations.

Bryoria alaskana is a species of horsehair lichen in the family Parmeliaceae. First described in 2016, it forms hair-like strands up to 15 cm (6 in) long that hang from tree branches in coastal forests. The species has a distinctive two-part distribution, being found in southeastern Alaska and the Sino-Himalayan Mountains of Asia. In Alaska, it grows primarily in the Alexander Archipelago on various trees including Pacific crabapple, western hemlock, and Sitka spruce. The lichen can be identified by its pale grayish-brown to reddish-brown coloring, evenly divided branching pattern, and white

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.

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