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<p>During a survey of foliicolous fungi in India, an interesting anamorphic fungal specimen was collected and isolated from diseased leaves of <i>Cassia fistula</i>. The fungus produced globose to subglobose, or acervular conidiomata, rarely pycnidial, that released creamy-white to light yellowish-brown conidial mass in creamy cirrhi on the host. Morphologically, the specimen resembles <i>Cylindrosporium cassiae</i>, previously placed in the family <i>Ploettnerulaceae</i>. However, its true generic affinity remained uncertain for a long time due to the absence of molecular sequence data and ultrastructural studies and was therefore classified solely on morphological features. A polyphasic approach, integrating morphological and cultural observations with multi-locus phylogenetic analyses (LSU, <i>RPB2</i>, ITS) and genealogical concordance phylogenetic species recognition, supports the establishment of a separate genus closely related to <i>Atlanticus</i>, within the family <i>Mycosphaerellaceae</i>. Consequently, a new genus, <i>Hyalokamalomyces</i>, is proposed, to accommodate <i>Cylindrosporium cassiae</i>. Morphologically, <i>Hyalokamalomyces</i> closely resembles <i>Septoria</i> and <i>Septoria</i>-like taxa; however, it can be readily distinguished by the ultrastructure of its conidiogenous loci and hila. In <i>Hyalokamalomyces</i>, the conidiogenous loci are flat or truncated and bear a small central conical depression, while the conidial base is truncated or occasionally slightly rounded, with hila showing a slight depression and a small conical structure corresponding to that of the loci. These unique ultrastructural features have not been reported in any genera within the <i>Mycosphaerellaceae</i>, nor in <i>Septoria</i> or <i>Septoria</i>-like species.</p>

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Hyalokamalomyces: a novel Septoria-like genus in Mycosphaerellaceae based on polyphasic evidences

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Soumyadeep Rajwar,
  • Sanjay Yadav,
  • Sanjeet Kumar Verma,
  • Gargee Singh,
  • Archana Singh,
  • Raghvendra Singh,
  • Samantha C. Karunarathna,
  • Paras Nath Singh,
  • Shambhu Kumar

摘要

During a survey of foliicolous fungi in India, an interesting anamorphic fungal specimen was collected and isolated from diseased leaves of Cassia fistula. The fungus produced globose to subglobose, or acervular conidiomata, rarely pycnidial, that released creamy-white to light yellowish-brown conidial mass in creamy cirrhi on the host. Morphologically, the specimen resembles Cylindrosporium cassiae, previously placed in the family Ploettnerulaceae. However, its true generic affinity remained uncertain for a long time due to the absence of molecular sequence data and ultrastructural studies and was therefore classified solely on morphological features. A polyphasic approach, integrating morphological and cultural observations with multi-locus phylogenetic analyses (LSU, RPB2, ITS) and genealogical concordance phylogenetic species recognition, supports the establishment of a separate genus closely related to Atlanticus, within the family Mycosphaerellaceae. Consequently, a new genus, Hyalokamalomyces, is proposed, to accommodate Cylindrosporium cassiae. Morphologically, Hyalokamalomyces closely resembles Septoria and Septoria-like taxa; however, it can be readily distinguished by the ultrastructure of its conidiogenous loci and hila. In Hyalokamalomyces, the conidiogenous loci are flat or truncated and bear a small central conical depression, while the conidial base is truncated or occasionally slightly rounded, with hila showing a slight depression and a small conical structure corresponding to that of the loci. These unique ultrastructural features have not been reported in any genera within the Mycosphaerellaceae, nor in Septoria or Septoria-like species.