Steven Don Leavitt

Teuvoa is a genus of lichen-forming fungi in the family Megasporaceae. It was first classified by lichenologists Mohammad Sohrabi and Steven Leavitt in 2013, with Teuvoa uxoris assigned as the type species. This genus was delineated from the larger genus, Aspicilia, following a molecular phylogenetic analysis which revealed that the Aspicilia uxoris species group constituted a distinct lineage in the Megasporaceae. Initially containing three species, two additional species native to China were added in 2018. Teuvoa is characterised by its small ascospores and conidia, and the absence of

Melanohalea tahltan is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016. The species name honours the indigenous Tahltan people that live in northern regions of the Canadian province British Columbia. The type was found along the Cassiar Highway, south of Kinaskan Lake, where it was growing on the bark of Salix. It has also been found in Thompson Plateau in southern British Columbia. Melanohalea tahltan is morphologically similar to Melanohalea multispora, but is genetically distinct from that species.

Melanohalea davidii is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016 and named in honour of lichenologist David Leslie Hawksworth. Though morphologically similar to Melanohalea exasperata, genetic analysis has established it as a distinct species, with DNA sequence data revealing fixed differences between the two taxa. The lichen is known from only two mid-elevation sites in Spain, where it grows as an epiphyte on oak and pine trees. Its restricted distribution suggests it may represent a relict species associated with Pleistocene glacial

Melanohalea columbiana is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016. The type was collected at the Rock Creek (Palouse River tributary) of the Channeled Scablands, where it was found growing on a species of hawthorne. The specific epithet columbiana refers to its occurrence in the Columbia River drainage basin and Columbian Plateau. The lichen has been recorded from Idaho, Washington, Central Oregon, and a single locale in the Peninsular Ranges in Southern California. It is morphologically similar to Melanohalea multispora, but is

Melanohalea clairi is a species of lichen in the family Parmeliaceae. It was described as a new species in 2016. It is known from only two locations in the United States. The type specimen was collected from the White River National Forest in Colorado, in juniper-oak mountainous shrubland. Here it was found growing on Gambel oak. It has also been collected from the Wasatch Front in central Utah, where it was recorded on bigtooth maple. The lichen is morphologically similar to Melanohalea subolivacea, but is genetically distinct from that species.

Melanohalea beringiana is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016. The type was collected near the Richardson Highway, north of Paxson, Alaska, where it was found growing on the bark of a trunk of balsam poplar. The specific epithet beringiana refers to its Alaskan distribution. It is morphologically similar to Melanohalea olivaceoides, but is genetically distinct from that species.

Melanohalea austroamericana is a species of foliose lichen in the family Parmeliaceae. It was described as a new species in 2016. The lichen is known only from two specimens collected in Chile's Laguna del Laja National Park, where they were discovered growing on bark in a forest of Chilean cedar. The specific epithet austroamericana refers to its South American distribution. Although Melanohalea ushuaiensis is somewhat similar in appearance to Melanohalea austroamericana, the latter species is clearly distinguished from the former by the presence of both soredia and isidia.

Melanelixia ahtii is a species of foliose lichen in the family Parmeliaceae. Found in the United States, it was formally described as a new species in 2016 by Theodore Lee Esslinger, Ana Crespo, Helge Thorsten Lumbsch, Pradeep Kumar Divakar, and Steven Leavitt. The type specimen was collected from the north side of the Columbia River Gorge (Klickitat County, Washington). Here, at an elevation of 75 m (246 ft) above sea level, it was found in a mixed oak-ponderosa pine forest, growing as an epiphyte on an oak. The species is known from DNA-verified collections in four western US states:

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Montanelia secwepemc is a species of foliose lichen in the family Parmeliaceae. It is a brown, leaf-like lichen that grows on rock surfaces in northwestern North America, with confirmed records from British Columbia, Yukon, and Alaska. The species was described in 2016 and named in honour of the Secwépemc people of British Columbia. It closely resembles other members of the Montanelia tominii species complex and was distinguished primarily through DNA sequence data.

Montanelia saximontana is a species of foliose lichen in the family Parmeliaceae. It is characterized by its olive-brown, leafy growth form with powdery reproductive structures (soredia) and a black underside. The species grows on rocks and occasionally on tree bark across western North America, from British Columbia south to Arizona. Originally described from specimens collected in Colorado in 1962, it was transferred to its current genus in 2016 based on DNA evidence. It is closely related to the Asian species Montanelia tominii and can only be reliably distinguished from it using DNA

Montanelia occultipanniformis is a species of foliose lichen in the family Parmeliaceae. It was formally described in 2016 based on molecular evidence that distinguished it from the morphologically similar Montanelia panniformis. As a cryptic species, it cannot be reliably identified by appearance alone and requires DNA sequencing for confident determination. The species is known from disjunct populations in Interior Alaska and the Russian Far East.

Letharia lupina is a species of lichen-forming fungus in the family Parmeliaceae. Commonly known as wolf lichen, it is a bright yellow-green, shrubby lichen that was split from Letharia vulpina in 2016 because, despite looking nearly identical, DNA evidence showed they are distinct lineages. It is widely distributed in western North America, where it grows on the wood and bark of conifers and other trees from valley floors to treeline. The thallus is rich in vulpinic acid, a toxic yellow pigment historically used in wolf baits in northern Europe. Outside North America, the species has also

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Anaptychia nevadensis is a species of foliose lichen in the family Physciaceae. It was described in 2022 from the north-western Great Basin of the western United States. It is an abundantly fertile, soredia-lacking member of section Protoanaptychia and differs from the Eurasian A. desertorum in having only scant whitish pruina (typically restricted to the lobe tips), longer ascospores on average, and frequent production of variolaric acid.

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Rhizoplaca shushanii is a species of crustose lichen in the family Lecanoraceae.

Rhizoplaca porteri is a species of crustose lichen in the family Lecanoraceae.

Rhizoplaca polymorpha is a species of crustose lichen in the family Lecanoraceae.

Rhizoplaca parilis is a crustose lichen in the family Lecanoraceae. Described in 2011, it was separated from the Rhizoplaca melanophthalma complex after molecular studies showed it forms an independent evolutionary lineage. It typically forms tightly attached, rosette-shaped growths with radiating lobes and a yellow-green surface, often featuring a dark, glossy centre when fruiting bodies are present. R. parilis occurs on exposed siliceous rock from about 2,000 metres up to 3,500 metres in habitats ranging from pinyon–juniper woodland to alpine tundra across North America, Europe, Asia and

Rhizoplaca occulta is a species of crustose lichen in the family Lecanoraceae. The species was described in 2013 after DNA analysis revealed it had long been hidden within the broadly defined species complex based around the widespread Rhizoplaca melanophthalma. Rhizoplaca occulta is a highly variable lichen can form either tightly attached, radiating growths with dark centers or loose, unattached cushions that roll freely on the ground. It is known only from high-elevation sites in Nevada, Idaho, and Utah, where it grows on exposed, calcium-poor rocks, though reliable identification

Rhizoplaca novomexicana is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecanoraceae. Found in North America, the lichen was first formally described as a new species in 1932 by Adolf Hugo Magnusson, as a member of the genus Lecanora. Sergey Kondratyuk proposed a transfer to the genus Protoparmeliopsis in 2012. Steven Leavitt, Xin Zhao, and H. Thorsten Lumbsch transferred it to the genus Rhizoplaca in 2015, when, following molecular phylogenetics analysis, they emended that genus to include three placodioid species previously placed in Lecanora.

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