Gyalectaceae Gyalecta hypoleuca (Petractis hypoleuca) Growth type crustose. BLS conservation evaluation: VU D2 NR Chemical results negative. Photobiont Trentepohlia In Britain and Ireland only recorded from sloping and vertical limestone boulders on the Isle of Portland, Dorset Thin greyish-white or yellowish-white epilithic thallus, tinged pinkish when fresh. Embedded urceolate apothecia with orangish disc, thick white margin with radiating fissures sometimes absent. Spores 5-9 septate without a perispore, 20-38 x 4.5-7 µm. Pycnidia absent. Micrographs below Similar: Petractis nodispora, spores 3-septate, multicellular conidia

Microscope photographs



Gyalecta hypoleuca (Petractis hypoleuca)
On limestone, Portland, Dorset. February and March 2016