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2. Taxonomic part 36<br />
43a Thallus usually distinctly fissured, surface verruculose to verrucose, subtropical.............<br />
............................................................................................... Myriotrema temperatum<br />
43b Thallus unfissured, surface continuous, tropical to more rarely extending in the subtropics<br />
...................................................................................................................... 44<br />
44a Thallus up to 300 µm high, ascospores up to 18(22) µm long with up to 4 loci,<br />
containing the hypoprotocetraric acid chemosyndrome ............. Myriotrema polytretum<br />
44b Thallus exceeding 300 µm in height, ascospores longer than 18(22) µm (up to 25[28]<br />
µm), containing the psoromic acid chemosyndrome or lacking secondary compounds 45<br />
45a Lacking secondary compounds, thallus with abundant calcium oxalate crystals,<br />
ascospores frequently with a single, longitudinal septum ................. Myriotrema album<br />
45b Containing the psoromic acid chemosyndrome, thallus without or with rather sparse<br />
calcium oxalate crystals, ascospores seldom with longitudinal septum.............................<br />
............................................................................................ Myriotrema clandestinum<br />
46a Ascomata chroodiscoid, at least in older stages, proper exciple fused or indistinctly<br />
(apically) free (inner thalline rim layers sometimes might be confused with proper<br />
exciple!) ..................................................................................................................... 47<br />
46b Ascomata not chroodiscoid, proper exciple distinctly free ......................................... 50<br />
47a Thallus thin, up to 150 µm high, with thin (up to 10 µm high), incontinuous cortex or<br />
ecorticate, ascospores up to 30 µm and with up to 10 loci........................................... 48<br />
47b Thallus thick, up to 400 µm high, distinctly corticate, ascospores up to 45 µm and with<br />
up to 12(14) loci...................................................................................... Chapsa tibellii<br />
48a (Sub)tropical species, ascospores up to 24 µm long, with up to 8(x2) loci........................<br />
................................................................................................... Chapsa phlyctidioides<br />
48b Cool-temperate species, ascospores up to 30 µm long, with up to 10 loci ................... 49<br />
49a Ascospores with thin cell walls, non-amyloid to faintly amyloid, containing the stictic<br />
acid chemosyndrome .............................................................................. Chapsa minor<br />
49b Ascospores with thick cell walls, distinctly to strongly amyloid, lacking secondary<br />
compounds ...................................................................................... Chapsa subpatens<br />
50a In older ascomata thalline rim becoming layered, proper exciple dark brown to slightly<br />
carbonized........................................................................... Thelotrema parvizebrinum<br />
50b Ascomata and proper exciple different or if thalline rim layered, proper exciple not<br />
dark, if proper exciple dark brown or carbonized, then only apically and thalline rim not<br />
layered ....................................................................................................................... 51<br />
51a Ascomata immersed ................................................................................................... 52<br />
51b Ascomata (at least in older stages) distinctly emergent .............................................. 55<br />
52a Ascospores 15-20 µm long, with 4 loci .................................... Thelotrema triseptatum<br />
52b Ascospores exceeding 20 µm and with more than 4 loci ............................................ 53<br />
53a Ascospores with thick cell walls, up to 40(45) µm long, with up to 14(16) loci,<br />
containing norstictic acid ........................................................... Thelotrema bicavatum<br />
53b Ascospores with thin cell walls, up to 35(40) µm long, with up to 11(12) loci,<br />
containing the stictic acid chemosyndrome or lacking secondary compounds ............. 54