Squamarina cartilaginea

Constit. of the lichen Squamarina cartilaginea. Red-orange needles (Me2CO). Mp 275-277°. 

Himmelreich U, Huneck S, Feige GB, Lumbsch HT (1994) Squamaron, ein Naphthochinon aus der Flechte Squamarina cartilaginea. Z Naturforsch 49b 1289-1291... 

The lichen Squamarina cartilaginea is sometimes infected by a Wardomyces fungus and then forms deep red spots on the thallus. The structure of this pigment, squamarone, has been elucidated by NMR spectroscopy as 2,6,8-trihydroxy-3-methyl-7-ethyl-l, 4-naphthaquinone (522). This is the first example of the formation of a phytoalexin by a lichen (370). The naphthaquinones cristazarin (523) and 6-methylcri-stazarin (524) have been isolated from cultures of the spore-derived mycobiont of Cladonia cristatella (744). 

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See also in sourсe #XX -- [ ]

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