Fungal endophyte (FE) communities can be shaped by environmental conditions and/or host-plant affinities. Hawaiʻi's landscape-dominant woody genus Metrosideros (Myrtaceae) comprises several vegetatively distinct taxa that are non-randomly distributed across environments, and their FE communities are poorly known. We examined the relative importance of Metrosideros taxon and environment (elevation) on FE communities on Oʻahu. ITS1 rDNA barcoding and sequencing of 113 trees detected a richness of 1,637 FEs representing 5 phyla, 223 genera, and 200 species. Variation in FE diversity was significantly explained by host taxon and site with considerable overlap in FE communities among taxa. FE communities did not vary between pubescent and glabrous taxa or across elevations, possibly due to the relatively narrow range of environmental conditions represented on Oʻahu relative to taller islands. A significant pattern of isolation by distance in FE composition was detected both among and within sites, consistent with restricted dispersal of FEs across the island.

真菌内生菌 (FE) 群落可以通过环境条件和/或寄主植物亲和力来塑造。夏威夷的景观优势木本属Metrosideros（桃金娘科）包括几个在不同环境中非随机分布的植物性独特分类群，它们的 FE 群落鲜为人知。我们研究了Metrosideros的相对重要性欧胡岛 FE 社区的分类群和环境（海拔）。ITS1 rDNA 条形码和 113 棵树的测序检测到 1,637 FEs 的丰富性，代表 5 门、223 属和 200 种。FE 多样性的变化可以通过寄主分类群和地点以及分类群之间 FE 群落的大量重叠来显着解释。FE 群落在短柔毛和无毛类群之间或不同海拔之间没有变化，这可能是由于瓦胡岛相对于较高岛屿的环境条件范围相对较窄。在站点之间和站点内都检测到了 FE 组成中距离隔离的显着模式，这与 FE 在整个岛上的扩散受限一致。