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Arcadia, L./ K. Knudsen 2012: The name Myriospora is available for the Acarospora smaragdula group. - Opuscula Philolichenum 11: 19-25. [RLL List # 226 / Rec.# 33601]
Abstract: The name Myriospora Nägeli ex Hue (1909) is not legitimate, because of its earlier validation by Uloth (1861). The name Myriospora Nägeli ex Uloth (1861) is here typified on M. smaragdula (Wahlenb. ex Ach.) Nägeli ex Uloth. The names Silobia M. Westb. & Wedin and Trimmatothelopsis Zschacke which have been used for the Acarospora smaragdula group, are placed in synonymy with Myriospora as circumscribed here. Seven new combinations are made in Myriospora: M. dilatata (M. Westb. & Wedin) K. Knudsen & L. Arcadia, M. hassei (Herre) K. Knudsen & L. Arcadia, M. myochroa (M. Westb.) K. Knudsen & L. Arcadia, M. rhagadiza (Nyl.) K. Knudsen & L. Arcadia, M. scabrida (Hedl. ex H. Magn.) K. Knudsen & L. Arcadia, M. tangerina (M. Westb. & Wedin) K. Knudsen & L. Arcadia, and M. versipellis (Nyl.) K. Knudsen & L. Arcadia. The new genus Caeruleum K. Knudsen & L. Arcadia is described to accommodate the species previously placed in Myriospora, necessitating two new combinations: C. heppii (Nägeli ex Körb.) K. Knudsen & L. Arcadia and C. immersum (Fink) K. Knudsen & L. Arcadia.
Notes: New genus: Caeruleum K. Knudsen & L. Arcadia; new combinations: Myriospora dilatata (M. Westb. & Wedin) K. Knudsen & L. Arcadia, M. hassei (Herre) K. Knudsen & L. Arcadia, M. myochroa (M. Westb.) K. Knudsen & L. Arcadia, M. rhagadiza (Nyl.) K. Knudsen & L. Arcadia, M. scabrida (Hedl. ex H. Magn.) K. Knudsen & L. Arcadia, M. tangerina (M. Westb. & Wedin) K. Knudsen & L. Arcadia, and M. versipellis (Nyl.) K. Knudsen & L. Arcadia, Caeruleum heppii (Nägeli ex Körb.) K. Knudsen & L. Arcadia and C. immersum (Fink) K. Knudsen & L. Arcadia.
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