Roccellaria mollis

C,9H3404, Mr 326.48, prisms, mp. 110-111 C, [ajp +35 (CHCI3). A paraconic acid derivative from the lichen Roccellaria mollis (Roccellaceae). 

Deriv Methyl roccellarate, needles (MeOH), mp 40-41 °C, [a]o + 25 (CHCI3), from roccellaric acid with ethereal CHjNj StL Roccellaria mollis (Hampe) Zahlbr. 

Huneck S, FoUmann G (1967) Uber die InhaltsstofFe von Roccellaria mollis (Hampe) Zahlbr. und die Struktur sowie absolute Konfiguration der Roccellarsaure. Z Naturforsch 22b 666-670... 

Huneck 174) isolated the new chromone 6-hydroxymethyleugenetin (124) from the lichen Roccella fuciformis. In addition the novel chromone glucosides galapagin (2), mollin (3) and roccellin (1) were isolated from Roccellaria mollis, Schismatomma accedens and Roccella galapagoensis while lobodirin (4) was isolated from Lobodirina cerebriformis 172, 175). The structure of these chromone glucosides have been discussed in Chapter 2. 

According to Follmann (1967) some hydrotic lichens that are found on the seacoast of warm arid regions have an additional advantage for water-vapor absorption. As a result of sea-spray evaporation these lichens, i.e., Chio-decton cerebriforme, Roccella portentosa, Roccellaria mollis, develop a salt-crust film that significantly contributes to water-vapor absorption. Tiny inorganic crystals on the surface crust of some lichens, in particular on Umbilicaria papulosa, can act as condensation nuclei and thus facilitate the uptake of atmospheric water vapor (Showman and Rudolf, 1971). 

Roccellaria mollis, 363, 387, 502 Roccellina, 607 Roccellinastrum, 627 Roccellodea, 607 Roccellographa, 607... 

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