Fungalpedia – Note 548, Mikhtomia 

 

Mikhtomia S.Y. Kondr., Kärnefelt, Elix, A. Thell & Hur

Citation when using this data: Tibpromma et al. 2024 (in prep.) – Fungalpedia, Ascomycota.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

Classification: Teloschistaceae, Teloschistales, Lecanoromycetidae, Lecanoromycetes, Pezizomycotina, Ascomycota, Fungi.

Kondratyuk et al. (2014) proposed Mikhtomia (Teloschistaceae, Teloschistales, Lecanoromycetes) based on molecular, morphological, and anatomical characters, with the type species Mikhtomia gordejevii. The type species of this genus was initially introduced as Placodium gordejevii by Tomin (1926). Mikhtomia species have the following morphological characters: thallus are crustose, continuous to areolate, the color ranges from dull greenish grey to dark greenish or grey, or dull to bright yellow or orange, with a palisade paraplectenchymatous cortical layer. Oil droplets are plentifully dispersed throughout apothecia biatorine, subhymenium, and the lower part of the hymenium; true exciple of Blastenia type. Ascospores polarilocular, 8-spored asci. Conidia are bacilliform to narrowly bacilliform. Constituents are thraquinones of fragilin and parietin chemosyndromes, as well as gyrophoric acid in some species (Kondratyuk et al. 2014). Previously, Mikhtomia had five species, all of which were found in East Asia. Later, Kondratyuk et al. (2017a) introduced Mikhtomia geumohdoensis and Kondratyuk et al. (2019) proposed it as a new combination Loekoeslaszloa geumohdoensis based on multigene phylogenetic analyses. Kondratyuk et al. (2017b) transfer Mikhtomia oxneri to Oxneriopsis oxneri based on unique morphology (brownish orange to dark brown orange or even blackish brown-orange discs of apothecia) and in forming a separate robust monophyletic branch. 

Type species: Mikhtomia gordejevii (Tomin) S.Y. Kondr., Kärnefelt, A. Thell, Elix, J. Kim, A.S. Kondr. & Hur 2014

Other accepted species: Species Fungorum – search Mikhtomia 

Figure 1 – Habitus of Mikhtomia multicolor. Scale bar: 500 μm. Redraw from Kondratyuk et al. (2014).

 

References

Kondratyuk SY, Jeong MH, Yu NNI, Kärnefelt A. et al. 2014 – A revised taxonomy for the subfamily Caloplacoideae (Teloschistaceae, Ascomycota) based on molecular phylogeny. Acta botanica Hungarica 56, 93–123. 

Kondratyuk SY, Lőkös L, Halda JP, Roux C. et al. 2017a – New and noteworthy lichen-forming and lichenicolous fungi 6. Acta Botanica Hungarica 59(1-2), 137–260.

Kondratyuk SY, Lőkös L, Farkas E, Jang SH. et al. 2019 – New and noteworthy lichen-forming and lichenicolous fungi 9. Acta Botanica Hungarica 61(3-4), 325–367.

Kondratyuk SY, Lőkös L, Upreti DK, Nayaka S. et al. 2017b – New monophyletic branches of the Teloschistaceae (lichen-forming Ascomycota) proved by three gene phylogeny. Acta Botanica Hungarica 59(1-2),71–136.

Tomin MP. 1926 – Spisok lishainikov Yuzhno-Ussuriiskogo Kraya [List of the lichens of South Us uriisk Territory]. Izvestiya Yuzhno-Ussuriiskogo otdela Gosudarstvennogo russkogo geograficheskogo obshchestva 12, 211–224.

 

Entry by

Lu W, Excellence Center of Microbial Diversity and Sustainable Utilization, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand; Center for Yunnan Plateau Biological Resources Protection and Utilization, College of Biological Resource and Food Engineering, Qujing Normal University, Qujing, Yunnan 655011, China

 

(Edited by Saowaluck Tibpromma, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

 

Published online 13 December 2024

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