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