Monoicomyces matthiatis T.Majewski

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 351

Monoicomyces matthiatis T.Majewski

MB#128602

Fig. 89A–C

Acta Mycologica 25 (1): 49 ( Majewski 1990a, as M. mathiatis ). –

Type: “ On Platystethus arenarius (Fourcr.) (Col., Staphylinidae ): Biala Woda near Szczawnica (Nowy Sacz voiv.), cow feces on pasture near Biala Woda stream, alt. about 640 m, 5.9.1987, leg. T.Majewski ( TM.3825 – holotype)”; KRAM. [ Poland]

Diagnostic features

Primary appendage two-celled, consisting of a basal inflated cell separated from the elongated apical cell by a darkened, oblique septum ( Fig. 88C , arrow). Thallus with only one developed antheridium, which consists of three tiers of cells, the 2 nd including two phialides ( Fig. 89B ). No secondary appendages from the 3 rd tier are formed. [Detailed descriptions: Majewski 1994b; De Kesel 2010]

Distribution and hosts

Only known from Poland (type) and Belgium ( De Kesel 2010), on Platystethus arenarius (Col. Staphylinidae Oxytelinae ). The host species is found in cow dung in pastures.

Collections examined from Denmark

On Platystethus arenarius (Geoffroy, 1785) (Col. Staphylinidae Oxytelinae ) DENMARK – Lolland, Falster, Møn (LFM) • Jydelejet, Møns Klint ; 54°59.171′ N, 12°31.954′ E; UA49; 2 May 2018; JP 1096; JP det.; ZMUC C-F-123613 .

Remarks

First record from Denmark. This is a very interesting species that occurs in company with Monoicomyces invisibilis on the same host. The first tier of paired cells of the antheridium seems to include two inner triangular cells that seem to be phialide initials, but none of the studied thalli show their functionality. This characteristic is not observed in any other species of the genus since these cells only exists in the 2 nd tier and above, not in the 1 st tier. Cell II directly supports the 1 st tier of paired cells in the antheridium ( Fig. 89B, t 1 ) without the presence of any intermediate cell serving as a pedicel. A photograph of this species is given here for the first time.

Figures

Fig. 89. Monoicomyces spp. A–C. M. matthiatis T.Majewski. A. Mature thallus. B. Lower receptacle (I, II, and III) and antheridium (tiers of cells labelled with t1–3) in detail. C. Central area of a thallus in detail showing cell III, the primary septum (a), and the darkened, oblique septum separating the basal inflated cell from the elongated apical cell of the primary appendage (arrow). – D–E. M. myllaenae Santam. D. Mature thallus from Spanish type slide kept in BCB. E. Broken and damaged thallus from Denmark. – F–G. M. nigrescens Thaxt. F. Primary appendage in detail showing cell III at the base. G. Immature thallus. Scale bars: A, D–E, G = 50 µm; B–C = 20 µm; F = 25 µm. Photographs from slides ZMUC C-F-123613 (A–C), BCB-SS2329c (D) (holotype), ZMUC C-F-124215 (E), ZMUC C-F-124217 (F–G).

Fig. 88. Comparison of antheridia from Monoicomyces invisibilis Thaxt. and Eumonoicomyces papuanus Thaxt. A–C. M. invisibilis. Respectively, near, middle and far focus of antheridium in detail. The three tiers of paired cells are labelled (t1–3), the basal cells of secondary appendages (bc sap 1–2), and in the middle focus (B), “an” points to the four phialides. – D–F. E. papuanus. Respectively, near, middle and far focus of antheridium in detail. The three tiers of paired cells are labelled (t1–3), the basal cells of a secondary appendages (bc sap), and in the middle focus (E), “an” points to the phialides and the arrow to the opening through which the spermatia flow out. Scale bars: 20 µm. Photographs from slides ZMUC C-F-123406 (A–C), FH2092 barcode 00313728 (D–F) (type).

Fig. 1. Herpomyces spp. A. H. ectobiae Thaxt.; mature thallus. – B. H. periplanetae Thaxt.; mature thallus showing the distal acute tooth-like outgrowth on the perithecium (arrow), and shield (sh). – C. H. stylopygae Speg.; mature thallus showing the distal acute tooth-like outgrowth on the perithecium (arrow), and shield (sh). Scale bars: A = 50 µm; B–C = 100 µm. Photographs from slides ZMUC C-F- 124041 (A), ZMUC C-F-123751 (B), and ZMUC C-F-124039 (C).