Seven new species of Graphilbum from conifers in Norway, Poland, and Russia

During surveys of insect-associated mycobiomes in Norway, Poland, and Russia, isolates with affinity to Graphilbum (Ophiostomatales, Ascomycota) were recovered. In this study, eight known Graphilbum species as well as the newly collected isolates were compared based on morphology and DNA sequence data for four gene regions. The results revealed seven new species, described here as G. acuminatum, G. carpaticum, G. curvidentis, G. furuicola, G. gorcense, G. interstitiale, and G. sexdentatum. In addition to these species, G. crescericum and G. sparsum were commonly found in Norway. All new species were recovered from conifers in association with bark beetles, cerambycid beetles, and weevils and were morphologically similar, predominantly with pesotum-like asexual morphs. Where sexual morphs were present, these were small ascomata with short necks and rod-shaped ascospores having hyaline sheaths. The results suggest that Graphilbum species are common members of the Ophiostomatales in conifer ecosystems.

在挪威、波兰和俄罗斯开展的昆虫关联真菌群落调查中，研究人员分离得到了隶属于子囊菌门（Ascomycota）长喙壳目（Ophiostomatales）线喙壳属（Graphilbum）的菌株。本研究基于形态学特征与4个基因区域的DNA序列数据，对8个已知的线喙壳属物种及本次新分离得到的菌株进行了比对分析。结果显示共发现7个新种，本次研究将其分别命名为G. acuminatum、G. carpaticum、G. curvidentis、G. furuicola、G. gorcense、G. interstitiale及G. sexdentatum。除上述新种外，G. crescericum与G. sparsum在挪威分布较为普遍。所有新种均分离自与小蠹虫、天牛及象鼻虫共生的针叶树，其形态特征较为相似，无性型多呈类柄喙壳形态。当存在有性型时，其表现为具短颈的小型子囊壳，以及带有透明鞘膜的杆状子囊孢子。研究结果表明，线喙壳属物种是针叶树生态系统中长喙壳目的常见类群。