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Orthophytum arcanum is a synonym of:

Orthocryptanthus arcanus (Leme) Leme, Zizka & Paule

Publ: Phytotaxa 544 (2): 148 (2022)

Type: BRAZIL. Minas Gerais: Conselheiro Pena, near the top of the Pico do Padre Angelo, 1441 m elevation, 19º18’59” S, 41º34’44” W, September 2015, R. Vasconcelos Leitão s.n., fl. cult. E. Leme 9093 (holotype RB!)

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Distribution: BRAZIL: Minas Gerais

Habitat: saxicolous in sun exposed to partially shady spots in the Campos Rupestres, forming small groups of individuals, ca 1440 m. Elev.

Etymology: The name of this new species is based on the Latin word “arcanum”, meaning mysterious, enigmatic, as a reference to its outlier status due to an unique combination of morphological characters and geographical range in the Atlantic Forest domain

Orthocryptanthus arcanus