666
R. H. THOMSON
Parmeliales
MeOl
Physcion(= Parietin) (R= Me)
[Teloschistes and Xanthoria spp.
(Teloschistaceae) Caloplaca and
Gasparrinia spp. (Caloplacaceae)]
Teloschistin (= Fallacinol)
(R= CH 2 OH) {Teloschistes
and Xantliovia spp.)
Fallacinal(R = CHO)
(Xanthoria sp.)
Parietinic acid(R = C0 2 H)
{Xanthoria sp.) (149)
(CXX)
Cladoniales
HO
HOCH 2 r^
Hok^
O
N H
II
II
o
OH
"^ C0 2 Me
\^
OH
Rhodocladonic acid
[Cladonia spp. (Cladoniaceae)]
(CXXI)
Endocrocin [Nephromopsis sp.
(Parmeliaceae) ]
(CVI)
lactone (CXXIII) are products of Sticta coronata (146). Pigments of
both types yield similar degradation products, and almost certainly have
OH
H 2 O 2 /H* T
or
Pb(OAc) 4
I
oc
OI
-co
^c
v
I
-o
-o
(CXXII)
(CXXIII)
HO
Oz
I
oc—o
C0 2 H
Pulvinic acid
(CXXIV)
the same precursors. Where they occur together it is conceivable that
the pulvinic acid compounds are derived from the quinones, as the