Department of Plant Biology, University of Illinois, 265 Morrill Hall, 505 S. Goodwin Avenue, Urbana, Illinois 61801.
Mycologia. 2004 Jul-Aug;96(4):822-33. doi: 10.1080/15572536.2005.11832929.
Two pyrenomycetes in the Annulatascaceae described from freshwater, Annulatascus triseptatus and Ascolacicola austriaca, are reported from North and South America for the first time. Both species occur commonly on submerged wood in the U.S.A. The two taxa are similar morphologically in having black coriaceous ascomata, cylindrical necks, septate paraphyses, cylindrical pedicellate asci with prominent apical rings and three-septate ascospores. Molecular data demonstrates that Annulatascus is polyphyletic, with A. triseptatus on a clade widely separated from the type species of the genus, A. velatisporus. Ascolacicola austriaca is on a monophyletic clade within the Annulatascaceae as sister taxon of A. triseptatus. Based on morphological data and phylogenetic analyses of 28S rDNA sequence data, new genera Annulusmagnus and Ascitendus are established for Annulatascus triseptatus and Ascolacicola austriaca, respectively.
首次报道了来自北美的两种淡水 Annulatascaceae 中的 pyrenomycetes，即 Annulatascus triseptatus 和 Ascolacicola austriaca。这两个物种在美国普遍存在于水下木材上。这两个分类群在形态上非常相似，具有黑色革质的子囊果、圆柱形的颈、分隔的侧丝、具有明显顶环的圆柱形具柄子囊和三分的子囊孢子。分子数据表明 Annulatascus 是多系的，A. triseptatus 位于与属的模式种 A. velatisporus 广泛分离的分支上。Ascolacicola austriaca 是 Annulatascaceae 中的一个单系分支，是 A. triseptatus 的姐妹分类群。基于形态学数据和 28S rDNA 序列数据分析，为 Annulatascus triseptatus 和 Ascolacicola austriaca 分别建立了新属 Annulusmagnus 和 Ascitendus。
