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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

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