Dimerium olivaceum
Dimerium olivaceum Syd. & P. Syd., Annls mycol. 2(2): 169 (1904).
Index Fungorum number: IF 234107; Facesoffungi number: FoF 03263, Fig. 1, 2
Description: see Boonmee et al. (2017).
Material considered: see Boonmee et al. (2017).
Fig. 1 Dimerium olivaceum (S-F11956, holotype, sexual morph, modified from Boonmee et al. 2017). a, b Herbarium material. c Appearance of colonies on leaves surface. d Ascomata on host surface. e Section of ascoma. f Peridium. g Pseudoparaphyses. h−k Asci. l−o Ascospores. Scale bars: c = 200 µm, d = 1000 µm, e = 100 µm, f = 20 µm, g, l−o = 10 µm, h−k = 50 µm.
Fig. 2 Dimerium olivaceum (S-F11956, holotype, asexual morph, modified from Boonmee et al. 2017). a Herbarium material. b, c Mycelium with hyphopodia-like structures. d−g Conidiophores and different stages of developing conidia. h−l Conidia. Scale bars: b = 100 µm, c = 20 µm, d−g = 50 µm, h−l = 10 µm.
Importance and distribution
There are 111 Dimerium epithets in Index Fungorum (2022), but many have been transferred to other genera such as Acantharia, Antennulariella, Asterina, Balladyna, Dimerina, Dothidasteromella, Dysrhynchis, Englera, Englerulaster, Epipolaeum, Gaillardiella, Immotthia, Kusanobotrys, Meliolina, Periline, Perisporiopsis, Phaeocryptopus, Phaeodimeriella, Porostigme, Protoventuria, Pseudomeliola, Schiffnerula, Stomatogene and Xenomeris. Currently, there are 72 species in Dimerium but they lack molecular data. Dimerium species are distributed on a wide range of hosts in Apocynaceae, Arecaceae, Asteraceae, Cannabaceae, Englerulaceae, Lamiaceae, Lauraceae, Malvaceae, Melastomataceae, Meliaceae, Meliolaceae, Olacaceae, Pinaceae, Polystomellaceae, Rubiaceae, Sapotaceae and Solanaceae. Dimerium species have a wide geographical distribution recorded from Africa (Sierra Leone), Asia (Japan, Java, Philippines, Tanzania), Caribbean (Dominican Republic), Central America (Costa Rica) and South America (Brazil, Colombia, Ecuador, Paraguay).
References
Saccardo PA, Sydow P. 1902 – Supplementum Universale, Pars V. Sylloge Fungorum 16, 1–1291.
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