Prillieuxina G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1–4): 161 (1918) [1917] ≡ Leprieurina G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1-4): 210 (1918) [1917]

Epiphytes on surface of leaves, forming minute, scattered, blackened areas. Superficial hyphae abundant on the host
surface, superficial, easily removed from the host, with or without appressoria, epidermal hypostroma (latter reported by Arnaud 1918). Sexual state: Thyriothecia superficial on the host, flattened, black, with basal peridium poorly developed, opening by central, stellate fissures. Upper wall linear, with compressed hyphae arranged radially from the centre toward the margin. Hamathecium lacking pseudoparaphyses. Asci 8-spored, bitunicate, globose-subglobose, apedicellate, without an ocular chamber. Ascospores overlapping 3–5-seriate, ellipsoidal with rounded ends, 1-septate, constricted at the septum, light brown to reddish-brown. Asexual state: “Leprieurina”, coelomyceteous, Pycnothyria same as sexual state. Conidia obovoid, widest near the apex and tapering towards lower end, sometimes 1-septate at lower cell, not constricted at the septum, brown to dark brown.

Notes: Prillieuxina was established by Arnaud (1918) based on P. winteriana (≡Asterina winteriana). Thyriothecia open with star-like fissures when mature, asci are globosesubglobose and ascospores are 1-septate and brown which is typical of Asterinaceae. Taxa in this genus are reported with appressoria. However, Arnaud (1918) illustrate sparse appressoria in the type of Asterina annonicola which he considered to be a synonym and showed haustoria penetrating the host cells beneath the thyriothecia. Since we have been unable to locate the type of Asterina winteriana and Arnaud (1918) had introduced Prillieuxina based on the type of Asterina annonicola (he had not observed Asterina winteriana) we acceptedArnaud’s interpretation of the genus based on his drawing Arnaud (1918) also introduced Leprieurina based on Leprieurina winteriana G. Arnaud, which was the pycnidial form of Asterina annonicola from the same specimen. As a single name can only be used for a biological species (Hawksworth 2012), Leprieurina is synonymized under Prillieuxina. Prillieuxina was considered to be a synonym of Asterinella by Doidge (1942), however in the type species, Asterinella puiggarii (Speg.) Theiss. the cells of peridium are not neatly arranged in parallel rows as in Microthyrium (Wu et al. 2011). Von Arx and Müller (1975) also treated Asterinella (Microthyriaceae) and Prillieuxina (Asterinaceae) as distinct for this reason.We maintain Prillieuxina as a distinct genus in Asterinaceae until it can be recollected and sequenced. There are 74 epithets in Index Fungorum (2014), however, like Asterina species these taxa were introduced based on host association. Molecular data is needed to confirm if species are host-generalists or host-specific and the absence or presence of appressoria and haustoria requires confirmation.

 Type species: Prillieuxina winteriana (Pazschke) G. Arnaud, Annals d’École National d’Agric. de Montpellier, Série 2 16(1–4): 162 (1918) [1917]