664
R. H. THOMSON
Fungal Dianthraquinones and Related Compounds
0
Skyrin(R = R'=Me)
[Penicillium, Sepedonium (124),
Penicilliopsis (124), and
Endolhia (Sphaeriales) spp.]
Hydroxyskyrin (R= Me ; R' = CH 2 OH)
[Penicillium andEndothia spp. (141)}
Pigment C (R = R' = CH 2 OH)
{Penicillium sp.)
(CXIV)
Iridoskyrin
(Penicillium sp.
(CXV)
Rubroskyrin
(Penicillium sp.
(CXVI)
Rugulosin
[Penicillium,
Sepedonium (124),
and Endotnia spp.]
(CXVII)
Luteoskyrin
[Penicillium and
Mycelia sterilia
spp. (142)]
(CXVIII)
a For references to individual species see (1), except where indicated.
that lichen metabolites are formed by the fungal half of the symbiont
was the isolation, by Raistrick (143), of the well-known lichen pigment
physcion (CXX; R = Me) from the fungus "Aspergillus tuber (Mangin)
Raper and Thorn." This received powerful support from the work of
Castle and Kubsch (144), who showed that the isolated fungal component of Claaonia cristateüa could still produce rhodocladonic acid