Autoicomyces aquatilis (F.Picard) I.I.Tav.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 27

Autoicomyces aquatilis (F.Picard) I.I.Tav.

MB#105077

Fig. 2D

Mycologia Memoirs 9: 148 ( Tavares 1985). – Basionym: Ceratomyces aquatilis F.Picard , Bulletin de la Société Mycologique de France 29: 560 ( Picard 1913) [MB#225059]. –

Type: [Type lost!] “Sur les segments ventraux de l’abdomen d’ Hydrochus carinatus Germ., Trappes (Seine-et-Oise), dans les canaux attenants à l’étang de St-Quentin”. [ France]

Autoicomyces melanocerus Speg. ( Spegazzini 1915b: 41) [MB#173533]. – Ceratomyces melanocerus (Speg.) Thaxt. ( Thaxter 1931: 350) [MB#270804]

Diagnostic features

Thallus variably darkened. Receptacle three-celled. The uppermost wall cell of the anterior row develops a subapical horn-like, unicellular, variably curved, almost blackish brown outgrowth ( Fig. 2D , arrow). [Detailed descriptions: Scheloske 1969; Majewski 1994b; Santamaria 2003]

Distribution and hosts

On Hydrochus Leach, 1817 (Col. Hydrochidae ) from Europe: France, Germany, Hungary, Italy (as A. melanocerus ), Poland, Spain ( Majewski 2008) and Sweden ( Huggert 2010); also in Cuba and USA ( Thaxter 1931).

Collections examined from Denmark

On Hydrochus crenatus (Fabricius, 1792) (Col. Hydrochidae )

DENMARK – Nordøstsjaelland (NEZ) • Heatherhill ; 56°5.240′ N, 12°8.611′ E; UC21; 22 May 2016; JP 91; JP det.; ZMUC C-F-122567 .

Remarks

First record from Denmark. Its presence in Denmark was expected given the presence of the species in neighbouring countries, such as Sweden and Germany.

Figures

Fig. 2. A–C. Helodiomyces elegans F.Picard. A. Mature thallus with labelling of cells VI, VI’ and VII. B–C. Details of perithecium, including ligules (li) in C. – D. Autoicomyces aquatilis (F.Picard) I.I.Tav.; mature thallus showing the perithecial outgrowth (arrow). – E. Autoicomyces humilis (Thaxt.) Thaxt.; mature thallus at the base of a host claw, and a sporeling on the right. – F–H. Ceratomyces pyrenaeus Santam.; mature thalli showing labelled perithecial excrescences (arrows in G). Scale bars: 50 µm. Photographs from slides ZMUC C-F-122583 (A–C), ZMUC C-F-122567 (D), ZMUC C-F-122566 (E), ZMUC C-F-123551 (F), and ZMUC C-F-123550 (G–H).