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<p>The present study reports for the first time that lichen thalli and ascomata may function as habitats for some trentepohliacean algae, including two new species described here, expanding the phylogenetic and ecological diversity in this algal lineage. Thorough sampling of <i>Trentepohlia</i> with various ecological traits was conducted at a single site, and the collected algae were morphologically and phylogenetically examined. Three species of <i>Trentepohlia</i> were revealed to inhabit lichens that are lichenized with other algae: <i>Trentepohlia associata</i> sp. nov., <i>T. cryptica</i> sp. nov., and <i>T. umbrina</i>. <i>Trentepohlia associata</i> sp. nov. was found invading the thalli of various foliose lichens, while <i>T. cryptica</i> sp. nov. was found exclusively inhabiting the hymenium of the ascomata of <i>Lecanora chionocarpa</i>. We considered these two algae to reproduce selectively on lichens since they formed zoosporangia growing on the hosts and were not found as free-living nor lichen-symbiotic algae. <i>Trentepohlia umbrina</i>, a cosmopolitan species previously regarded as a free-living alga and a lichen photobiont, was found as a lichen photobiont but also as an inhabitant of foliose lichens, ecologically connecting previously unlinked lichens. Based on our observations, where <i>T. associata</i> and <i>T. umbrina</i> –but not <i>T. cryptica–</i> often accompanied lichenicolous fungi, these two species may inhabit partly degraded parts of the host thalli, whereas <i>T. cryptica</i> may have an ability to invade the intact hymenium of the host lichen.</p>

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Examples of diverse lichen-associated lifestyles of terrestrial algae Trentepohlia

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Takato Moriyama,
  • Shinji Handa,
  • Yoriko Sugiyama,
  • Chiharu Endo,
  • Chihiro Tanaka,
  • Yuji Isagi

摘要

The present study reports for the first time that lichen thalli and ascomata may function as habitats for some trentepohliacean algae, including two new species described here, expanding the phylogenetic and ecological diversity in this algal lineage. Thorough sampling of Trentepohlia with various ecological traits was conducted at a single site, and the collected algae were morphologically and phylogenetically examined. Three species of Trentepohlia were revealed to inhabit lichens that are lichenized with other algae: Trentepohlia associata sp. nov., T. cryptica sp. nov., and T. umbrina. Trentepohlia associata sp. nov. was found invading the thalli of various foliose lichens, while T. cryptica sp. nov. was found exclusively inhabiting the hymenium of the ascomata of Lecanora chionocarpa. We considered these two algae to reproduce selectively on lichens since they formed zoosporangia growing on the hosts and were not found as free-living nor lichen-symbiotic algae. Trentepohlia umbrina, a cosmopolitan species previously regarded as a free-living alga and a lichen photobiont, was found as a lichen photobiont but also as an inhabitant of foliose lichens, ecologically connecting previously unlinked lichens. Based on our observations, where T. associata and T. umbrina –but not T. cryptica– often accompanied lichenicolous fungi, these two species may inhabit partly degraded parts of the host thalli, whereas T. cryptica may have an ability to invade the intact hymenium of the host lichen.