MycoBanknumber:MB 27825;IndexFungorumnumber:IF 27825;Facesoffungi number: FoF 08876; one morphologically and phylogenetically delimited species (Nelsen et al. 2011a).

Lichenized on leaves in terrestrial, lowland to lower montane tropical forests.Thallusthinly corticate, grey-green with characteristic metallic appearance.Photobiont Trentepohlia.Sexual morph:Ascomataperithecia, immersed in groups in slightly prominent pseudostromata covered by thallus layer and with a medulla containing ochraceous-yellow, K+ dark red, powdery crystals; individual perithecia ostiolate.Involucrellumabsent.Excipulumprosoplectenchymatous, brown.Hamatheciumcomprising 1.5–2 µm wide paraphyses, hyaline, flexuose, unbranched to sparsely branched at the base.Asci8-spored, bitunicate, fissitunicate, narrowly clavate to oblong-fusiform, shortly pedicellate, with narrow ocular chamber, non-amyloid.Ascosporesirregularly arranged to biseriate, fusiform, hyaline, 3(–5)-septate, with thin eusepta and rectangular lumina, smooth-walled, not or slightly constricted at the septa.Asexual morph:Pycnidiacommon, immersed in groups in slightly prominent pseudostromata covered by thallus layer and with a medulla containing ochraceous-yellow, K+ dark red, powdery crystals; often whole thalli producing pycnidia only.Conidiaacrogenous, only macroconidia known; macroconidia 3(–5)-septate, narrowly bacillar to acicular, distal end with a very narrow, ciliate appendage about one third as long as the conidia, proximal end with a short, gelatinous cap, hyaline.

Chemistry: Unidentified ochraceous-yellow anthraquinone crystals in ascomatal and pycnidial pseudostromata.

Typespecies:Flavobatheliumepiphyllum Lücking et al., Lichenologist 29: 221 (1997).

Notes:Flavobathelium is thus far a monospecific, tropical genus growing on living leaves (Lücking et al. 1997; Lücking 2008). Given the inclusion of nonfoliicolous species with multi-septate to muriform ascospores and macroconidia in a single genus,Swinscowia(see below), one could theoretically considerFlavobatheliumandPhyllobatheliumconspecific. However, the two genera are not directly related phylogenetically, withFlavobatheliumsister toSwinscowiaandPhyllobatheliumsister to the clade including the two other genera, with strong support (Fig. 70). This also sup- ports the separation ofSwinscowiafromPhyllocrateraand may indicate thatSwinscowiaas here circumscribed is still heterogeneous, requiring assessment of some of the genuinely muriform-spored species currently included in the latter genus.

Fig. 70Best scoring maximum-likelihood tree (also including Bayesian posterior probabilities) ofStrigulaceae showing the currently recog- nized and sequenced genera (adapted from Jiang et al. 2020b; see that reference for further details)

Species