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2. Taxonomic part 42
115a Thallus thin, ascomata immersed, lacking secondary compounds ...................................
.............................................................................................. Myriotrema subconforme
115b Thallus moderately thick to thick, ascomata immersed to distinctly emergent, with
secondary metabolites .............................................................................................. 116
116a Pores becoming wide to gaping, exceeding 300 µm in diameter (up to 600 µm),
containing the hypoprotocetraric acid chemosyndrome ........... Myriotrema viridialbum
116b Pores small, up to 100(200) µm in diameter, chemistry different ............................. 117
117a Ascomata large, conspicuous, up to 1(1.5) mm in diameter, proper exciple thick,
bearing apical fibrillae, containing the psoromic acid chemosyndrome and/or
‘platyspora unknown’ compounds ................................................... Fibrillithecis halei
117b Ascomata small, inconspicuous, up to 400 µm in diam., proper exciple different,
containing the psoromic acid chemosyndrome ........................... Myriotrema rugiferum
2. 9. Genera
The following table provides an overview of the genus delimiting characters in the here
treated group. Accepted genera in thelotremataceaen Graphidaceae that are treated elsewhere
include: Acanthotrema, Ampliotrema, Diploschistes, Gyrotrema, Ingvariella, Melanotrema,
Ocellularia, Redingeria and Stegobolus.
Table 4: Main genus delimiting characters and other features of the treated groups. Explanation of the
code: X =applicable in most cases, X =applicable in fewer cases, - =not applicable. [*: for further
explanations see part 2. 5. 2.; a : aseptate in C. anomalus; b : not tested in most species; c : the type
species L. zollingeri contains the hypoprotocetraric acid chemosyndrome; d : paraphyses tips and ascus
structure could not be observed due to the mazaedium; e : isidia-like structures often present, probably
representing immature ascomata (see part 2. 9. 9.); f : presence of lateral paraphyses uncertain (see part
2. 9. 10.); g : a ‘key-hole appearance’ of the ascus tips was reported for some specimen (see part 2. 9.
10.); h : ascoconidia.]
Substrate
Chapsa
Chroodiscus
Fibrillithecis
Leptotrema
bark X - X X X X X X X X X X X
rock X - - - - - - - - - X X -
leaves X X - - - - - - X - - - -
bryophytes X - X - - X - - - X - X -
wood X - - - - - - - - - - X -
soil X - - - - - - - - - - - -
peaty soil/plant debris X - - - - - - - - - - X -
Leucodecton
Melanotopelia
Myriotrema
Nadvornikia
Pseudoramonia
Reimnitzia
Thelotrema
Topeliopsis
L. schizolomagroup