Gyalidea hyalinescens (Nyl.) Vězda
Lecidea hyalinescens Nyl., Acta Soc. linn. Bordeaux 21: 355 (1856).
Gyalecta berggrenii Hellbom, Bihang K. Sv. Vet.-Akad. Handl. 21 (3) 13: 71 (1896).
Thallus thin (to 200 µm thick), dark greyish to olive-brownish, warty, somewhat leprous or lacking. Apothecia sessile 0.2-1.2 mm diam., 0.2-0.3 mm high, sessile to subimmersed, concave, disc brownish-pink or yellowish-brown, shining, varnish-like, margins prominent, whitish or pale flesh-coloured, translucent when wet, entire to subcrenate, distinctly inflexed when young obscuring disc. Hymenium 100-130 µm tall, colourless or yellowish with inspersed yellowish granules. Paraphyses, simple 1 µm thick. Asci 70-90 × 12-20 µm. Ascospores oblong-fusiform, slightly constricted at septa, 3-septate, 13-19(-25) × 5-6.5 µm.
S: Otago. Dunedin on volcanic rock. Collected once by Sven Berggren in May 1874. His collections described as Gyalecta berggrenii by Hellbom are preserved in the herbarium of the Naturhistoriska Riksmuseet in Stockholm. The species is very easily overlooked and doubtless is more widespread than this single collection indicates.
Cosmopolitan
The New Zealand material is identical in all respects with European and British specimens of G. hyalinescens. This is the first recorded occurrence of the species in the Southern Hemisphere.
Gyalecta berggrenii. Lectotype: New Zealand. Otago, Dunedin, På vulkanen lava, May 1874. Sven Berggren, S!
