Porina lucida

Porina cf. lucida 1 & 2 R. Sant., Symb. bot. upsal. 12 (no. 1): 240. 1952. Fig. 14 D, E Type. INDONESIA • Java, Preanger, Tjibodas, Jul. 1898, Nyman 6 B (holotype: UPS). Notes. New record for Mayotte. Porina lucida is a common and widely distributed tropical species (Lücking 2008). It has previously been reported from Madagascar by Aptroot (2016). P. cf. lucida 1 (Fig. 14 D) comprises specimens 20270 H, 20272 C, and 20272 F from northern Madagascar, whereas P. cf. lucida 2 (Fig. 14 E) is represented by specimen 21938 B from Mayotte. Both taxa broadly conform to Santesson’s (1952) original description of P. lucida. Ascospores are 7 - septate, measuring (31 –) 34–40 (– 44.5) × (4 –) 4.5–5.1 (– 5.3) µm (n = 24) in P. cf. lucida 1 and (36 –) 38–43 (– 45) × (4 –) 4.5–5.1 (– 5.3) µm (n = 57) in P. cf. lucida 2, broadly consistent with the originally reported dimensions of 35–45 × 4–5 µm (Santesson 1952). However, a minority (ca. 10 %) of P. cf. lucida 2 ascospores are 8 - septate. Both taxa possess lens-shaped to hemispherical perithecia with a spreading base, a pale yellowish tinge and an occasionally darker, applanate apex. Although the observed perithecia tend to be more hemispherical than lens-shaped, and those of P. cf. lucida 1 are slightly larger (0.5–0.7 mm; n = 10) than the originally reported 0.4–0.6 mm. In the ITS and the mtSSU phylogenies, the two taxa are recovered as distinct lineages within the Paleotropical P. epiphylla - P. lucida subclade of the Phylloporina clade (Figs 2, 3). The mtSSU phylogeny further shows that neither lineage clusters with the available Neotropical accessions identified as P. lucida, suggesting that these Neotropical accessions may represent distinct lineages. Porina cf. lucida 2 was associated exclusively with algal haplotype 26: 1, Porina cf. lucida 1 was associated with two algal haplotypes (26: 1 and 26: 3) (Figs 4, 5). Overall, because the type of P. lucida originates from Java and no type-linked sequences are available, the identity of the Paleotropical lineage remains uncertain. The recovered taxa are therefore retained as P. cf. lucida 1 and P. cf. lucida 2. Specimens examined. MADAGASCAR – Diego Suarez Prov. • Antsiranana, Region: Diana, District: Diego II, Commune: Joffreville, Forontany: Morafeu, National Park of Montagne d’Ambre, along trail from Gîte des Roussettes, across stream at small dam to dirt road and trail down to Lake Mahasarika, moist but not wet lower montane forest, with tall trees and tree ferns, 12°32'03"S, 49°10'28"E, alt. 1177 m, 7 Oct. 2014; Ertz 20272 C, 20272 F (BR, TAN). • ibid., Gîte des Roussettes, mixed open woodland, around house and picnic area, 12°31'37"S, 49°10'18"E, alt. 1068 m, 6 Oct. 2014; Ertz 20270 H (BR, TAN). – MAYOTTE – South of Tsararano • trail to Mount Bénara, 12°52'45.2"S, 45°09'39.0"E, alt. 575 m, dense humid hillside forest, 01 Oct. 2017; Ertz 21938 B (BR).