Lichens marins - Athallia itiana Cf. (Cl. Roux, M. Boulanger et Malle) Cl. Roux. =Caloplaca itiana Cf. Cl. Roux, M. Boulanger et Malle.

Athallia itiana Cf. (Cl. Roux, M. Boulanger et Malle) Cl. Roux. =Caloplaca itiana Cf. Cl. Roux, M. Boulanger et Malle.

Athallia itiana Cf. (Cl. Roux, M. Boulanger et Malle) Cl. Roux.

=Caloplaca itiana Cf. Cl. Roux, M. Boulanger et Malle.

Caloplaca itiana Cf. Cl. Roux, M. Boulanger et Malle.

Description

Thallus very thin, more or less endolithic, cracked to areolate by the dry, whitish, white-yellowish, pale yellowish, pale ochraceous, a little salmon... so fresh and humid, becoming barely visible in the herbarium, no distinct prothalle. Apothecia numerous, sessile, 0.3-0.8- mm in diameter, flat disc, finely rough, lemon yellow, yellow, for young and fresh apothecia, dirty yellow, ocraceous yellow, yellow-orange for old apothecia, orange for dry apothecia in herbarium, generally clearly visible margin, concolor. Utriform asci with 8 spores. Polarilocular, hyaline, elliptical spores, 13-16 x 6-7 µm with a 5-6 µm septum according to the literature, 13-20 x 7-9 µm with a 5-8 µm septum according to our measurements. Paraphyses sometimes partitioned, only ramified towards their top which is swollen. Thallus: K- or K +/- purple, apothecia: K + purple. Very variable taxon both macroscopically and microscopically (even on the same site) having the appearance of Caloplaca holocarpa and very similar to Caloplaca navasiana which is a Mediterranean species. This taxon comes from the zone of seawater projections at the level of Hydropunctaria maura and Caloplaca microthallina, here just above a sill of dolerite included in the sandstones of Kermeur and the tuffs and limestones of Rozan (Upper Ordovician ). N.B. We relate this taxon to Caloplaca itiana which has a similar habitat but with certain reservations that is why we put Cf.