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2. Taxonomic part 28
Chromatographic behavior of new or unknown substances
Table 1: TLC characteristics of the four hitherto unknown substances (according to Elix, pers. com.)
and for the ‘cinchonarum and platysporum unknowns’.
Rf values for
solvent system:
Compound name A B' C Spot characteristics (after charring)
2-hydroxyhypoprotocetraric
acid
12 29 7 dark blue to dark gray or black
2-hydroxynornotatic acid 7 25 4 dark blue to dark gray
O-methylolivaceic acid 7 23 17 pale purplish to grayish-brown
olivaceic acid 2 14 4 pale purplish to grayish-brown
‘cinchonarum unknown’ 2 7 3 (dark) gray
'platysporum unknown' 53 57 60
(dark) brown with yellowish to
greenish aurora under UV light
The following previously informal compound names used by several authors (e.g. Frisch,
2006; Hale, 1974a) could be assigned to the following secondary metabolites:
‘neoterebrans unknown’ =O-methylolivaceic acid
‘olivaceum unknowns’:
-high =norisonotatic acid
-medium =norsubnotatic acid
-low =olivaceic acid
2. 6. Ecology
The ecology of thelotrematoid lichens is poorly known, and the following is mainly based
on field observations and the available data from the collection labels. A more detailed
summary of the general ecology and habitat preferences of thelotremataceaen Graphidacae
can by found in Frisch (2006). General treatments of the diversity and ecology of the lichen
biota in tropical rainforests are provided by Coppins & Wolseley (2002), Galloway (1991),
Lakatos & al. (2006) and Sipman & Harris (1989). Information on the substrate ecology of
lichens is given by Armostrong (1988) and Brodo (1973).
2. 6. 1. Substrate
The majority of taxa occur on bark of various trees and shrubs. However, several species
and some genera have a preference for other substrates, such as wood, leaves, bryophytes,
detritus, soil and siliceous rock. Members of the genus Chroodiscus are strictly foliicolous,
Melanotopelia and many species of Topeliopsis s. str. are found on bryophytes, where they
often extend onto adjacent substrates (bark, wood, rock). Several (sub)alpine Tasmanian taxa