Genus

Kohlmeyeriopsis

Species

medullaris

Author

(Kohlm., Volkm.-Kohlm. & O.E. Erikss.) Klaubauf, Lebrun & Crous Stud. Mycol. 79: 101 (2014)

Class

Sordariomycetes, Subclass Sordariomycetidae

Order

Magnaporthales

Family

Magnaporthaceae

Synonymy: ≡ Gaeumannomyces medullaris Kohlm., Volkm.-Kohlm. & O.E. Erikss., Mycologia 87(4): 540 (1995), = Trichocladium medullare Kohlm. & Volkm.-Kohlm., Mycotaxon 53: 349. 1995.

Kohlmeyeriopsis Klaubauf, Lebrun & Crous Stud. Mycol. 79: 101 (2014)

Type species:

Kohlmeyeriopsis medullaris (Kohlm., Volkm.-Kohlm. & O.E. Erikss.) Klaubauf, Lebrun & Crous Stud. Mycol. 79: 101 (2014)

≡ Gaeumannomyces medullaris Kohlm., Volkm.-Kohlm. & O.E. Erikss., Mycologia 87(4): 540 (1995)

= Trichocladium medullare Kohlm. & Volkm.-Kohlm., Mycotaxon 53: 349. 1995.

Sexual morph: saprobic ascomata 350-450 µm high, 490-750 µm diam, ellipsoidal, immersed, ostiolate, coriaceous, dark brown, single, at the base of the culms. Neck 165-230 µm long, 125-150 µm in diam, cylindrical, lateral or central, periphysate; under the dissecting microscope visible as a small black circle on the surface of the culm. Peridium 40-50 µm thick, 7-12 layers of thin-walled cells, small on the outside, increasing in size towards the centrum, forming a textura angularis in longitudinal section, in young ascomata merging with the hyaline pseudoparenchyma of the centrum. Hamathecium with numerous paraphyses, 4-8 µm diam, unbranched, septate, tapering at the free tip. Asci 160-185×8-10 um, 8-spored, fusoid to cylindrical, tapering at the base into a short stalk, thin-walled, unitunicate, with a ring-shaped apical apparatus, maturing successively at the bottom of the locule. Ascospores 110-180×3-4 µm, filamentous, slightly tapering towards the base, indistinctly septate (septa occluded by oil droplets), without apical chambers, hyaline, coiled around each other in the ascus; germ tubes produce fuscous appressoria. Single spore isolates on seawater agar form conidia after about a week. Asexual morph: Conidia developing in the medulla on hyphae or on short lateral conidiogenous cells, 1-septate: with a large ellipsoidal, fuscous apical cell and one (rarely two) small cylindrical or obconical, light brown basal cell(s); lower cell mostly forming at a slight angle with the upper cell; apical cell 13.5-20.5 × 7-10 µm, basal cell 3.5-6 × 3-5 µm.

 

Key references:

Jones EBG, Suetrong S, Sakayaroj J, Bahkali AH, Abdel-Wahab MA, Boekhout T, Pang KL (2015) Classification of marine Ascomycota, Basidiomycota, Blastocladiomycota and Chytridiomycota. Fungal Diversity 73: 1-72.

Klaubauf S, Tharreau D, Fournier E, Groenewald JZ, Crous PW, de Vries RP, Lebrun MH (2014) Resolving the polyphyletic nature of Pyricularia (Pyriculariaceae). Studies in Mycology 79: 85-120.

Kohlmeyer J, Volkmann-Kohlmeyer B (1995) Fungi on Juncus roemerianus. I. Trichocladium medullare sp. nov. Mycotaxon 53: 349-353.

Kohlmeyer J, Volkmann-Kohlmeyer B, Eriksson OE (1995) Fungi on Juncus roemerianus. 4. New marine ascomycetes. Mycologia 87: 532-542.

Maharachchikumbura SSN, Hyde KD, Jones EBG, Mckenzie EHC, Huang SK,

Abdel-Wahab MA et al. (2015) Towards a natural classification and backbone tree for Sordariomycetes. Fungal Diversity 72: 199-299.

Seifert KA, Morgan-Jones G, Gams W, et al. (2011) The Genera of Hyphomycetes. CBS Biodiversity Series no. 9. CBS-KNAW Fungal Biodiversity Centre, Utrecht.

Type & Location:
Other Specimens:
Substratum:
Lower parts of senescent culms of Juncus roemerianus.
Habitat:
Distribution:
Atlantic Coast (USA: North Carolina).
Pertinent Literature:
Comments:
NOTES: Kohlmeyeriopsis was introduced to accommodate Gaeumannomyces medullaris that was originally described from dead culms of Juncus roemerianus in North Carolina (Kohlmeyer et al. 1995, Klaubauf et al. 2014). However, G. medullaris did not group with the type species of Gaeumannomyces (G. graminis) and the new genus was introduced. The asexual morph of G. medullaris is Trichocladium medullare, and is therefore synonymized under Kohlmeyeriopsis (Kohlmeyer et al. 1995). The genus Gaeumannomyces has harpophora-like asexual morphs, and the genus Trichocladium is heterogeneous (Seifert et al. 2011). The genus Kohlmeyeriopsis is accepted in the Magnaporthaceae (Magnaporthales) by Jones et al. (20150 and Maharachchikumbura et al. (2015).

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