Since the advent of molecular taxonomy, numerous lichen-forming fungi with homoiomerous thalli initially classified in the family Collemataceae Zenker have been transferred to other families, highlighting the extent of morphological convergence within Lecanoromycetes O. E. Erikss. & Winka. While the higher level classification of these fungi might be clarified by such transfers, numerous specific and generic classifications remain to be addressed. We examined the relationships within the broadly circumscribed genus Arctomia Th. Fr., which has been the recipient of several transfers from Collemataceae. We demonstrated that Arctomia insignis (P. M. Jørg. & Tønsberg) Ertz does not belong to Arctomia s. str. but forms a strong monophyletic group with Gabura fascicularis (L.) P. M. Jørg. We also confirmed that Arctomia borbonica Magain & Sérus. and the closely related Arctomia insignis represent two species. We formally transferred A. insignis and A. borbonica to the genus Gabura Adans. and introduced two new combinations: Gabura insignis and Gabura borbonica. We reported Gabura insignis from Europe (Scotland and Ireland) for the first time. While material from Europe and North America is genetically almost identical, specimens from Madagascar, South Africa and Reunion Island belong to three distinct phylogenetic lineages, all of which are present in the latter area and may represent distinct species. In its current circumscription, the genus Gabura may contain up to six species, whereas Arctomia s. str. includes only two species (A. delicatula Th. Fr. and A. teretiuscula P. M. Jørg.). The Gabura insignis group is shown to have an unexpectedly large, subcosmopolitan distribution. With the extended sampling from Arctomiaceae Th. Fr., the placement of Steinera sorediata P. James & Henssen in the genus Steinera Zahlbr. is confirmed and the presence of a new Steinera species from Chile is highlighted.

中文翻译：

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Gabura（牛蒡科）扩大范围的系统发育证据

自从分子分类学出现以来，许多具有同种菌体的地衣形成真菌最初被归入该科伞形科Zenker 已被转移到其他家族，突出了 Lecanoromycetes OE Erikss 内形态学趋同的程度。&温卡。虽然这些真菌的更高级别分类可能会通过这种转移得到澄清，但仍有许多具体和通用的分类有待解决。我们检查了广泛限定的属内的关系牛膝钍。Fr.，它已经接受了几次转账伞形科. 我们证明了牛蒡(PM Jørg. & Tønsberg) Ertz 不属于牛膝s。海峡 但形成了一个强大的单系群束状加布拉(L.) PM Jørg。我们也确认了牛蒡Magain & Sérus。和密切相关的牛蒡代表两个物种。我们正式转让A. insignis和A. borbonica属加布拉阿丹斯。并引入了两种新组合：Gabura insignis和Gabura borbonica. 我们报道了Gabura insignis首次来自欧洲（苏格兰和爱尔兰）。虽然来自欧洲和北美的材料在基因上几乎相同，但来自马达加斯加、南非和留尼汪岛的标本属于三个不同的系统发育谱系，所有这些都存在于后一个地区，并且可能代表不同的物种。在目前的范围内，该属加布拉可能包含多达六种，而牛膝s。海峡 仅包括两个物种（A. delicatula钍。神父。和A. teretiuscula约尔格总理）。这Gabura insignis组被证明具有出乎意料的大，次世界性分布。随着扩展采样从牛蒡科钍。Fr., 的位置石竹P. James & Henssen 属施泰纳拉扎尔布。被确认并且存在一个新的施泰纳拉智利的物种被突出显示。