During fieldwork to assess the status and ecology of Physcomitrium eurystomum Sendtn. in Britain, a naturally occurring sporophytic hybrid was found involving female Physcomitrium patens (Hedw.) Mitt. and male P. eurystomum, previously given the invalid name Physcomitrella amanni Głow. nom. nud. Recent authors have usually placed P. patens in Physcomitrella Bruch & Schimp. or Aphanorrhegma Sull., but Medina et al. (2019) show both are synonymous with Physcomitrium. Hill et al. (2006) comment Physcomitrella × hampei Limpr. is usually interpreted as Physcomitrium patens × P. eurystomum, for example by Frey et al. (2006), but the protologue for P. × hampei clearly describes parentage as female P. patens and male P. sphaericum (Limpricht 1885), as stated correctly by various subsequent authors, such as Britton (1895), Györffy (1907) and Nieuwkoop (2016). The purpose of this note is to provide a valid name and description for the sporophytic hybrid Physcomitrium patens × P. eurystomum, and to describe its differentiation and designate a type. Turland et al. (2018) is followed for nomenclatural guidance.

中文翻译：

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Physcomitrium × stevensoni DACallaghan (Physcomitrium patens × P. eurystomum) (Funariaceae, Bryophyta)，一种罕见的杂交苔藓的新名称

在评估 Physcomitrium eurystomum Sendtn 的现状和生态的实地考察期间。在英国，发现了一种自然发生的孢子体杂种，涉及雌性 Physcomitrium patens (Hedw.) Mitt。和雄性 P. eurystomum，以前被赋予无效名称 Physcomitrella amanni Głow。名义。裸体。最近的作者通常将 P. patens 放在 Physcomitrella Bruch & Schimp 中。或 Aphanorrrhegma Sull。，但 Medina 等人。(2019) 显示两者都是 Physcomitrium 的同义词。希尔等人。(2006) 评论 Physcomitrella × hampei Limpr。通常被解释为 Physcomitrium patens × P. eurystomum，例如 Frey 等人。(2006)，但是 P. × hampei 的原始描述清楚地将亲子关系描述为雌性 P. patens 和雄性 P. sphaericum (Limpricht 1885)，正如 Britton (1895) 等各种后续作者正确陈述的那样，Györffy (1907) 和 Nieuwkoop (2016)。本说明的目的是为孢子体杂交 Physcomitrium patens × P. eurystomum 提供有效的名称和描述，并描述其分化和指定类型。图兰等人。(2018) 遵循命名指南。