posidoniae

Type species: Paralulworthia posidoniae A. Poli, E. Bovio, L. Ranieri, G.C. Varese & V. Prigione, Frontiers in Microbiology 11 (no. 933): 9 (2020) 

Mycobank MB833291

Growing actively on Pinus pinaster. Hyphae 2.5 – 3.5 μm wide, septate, from hyaline to dematiaceous.

Sexual morph: Ascomata 365 – 450 × 155 – 230 μm, ellipsoidal, single, scattered, immersed in the cortex or erumpent, brown to black at maturity; peridium dark brown 23 − 50 μm thick composed of several layers of thick-walled cells of textura angularis. Asci 150 – 190 × 40 – 60 μm, containing 8 spores, clavate and early dehiscent. Sterile elements not observed. Ascospores oblong, 32 – 43 × 12 – 16 μm, uni- to 3-septate at maturity, constricted at septa (particularly the central one), ellipsoid to fusiform, pointed at both ends, thin-walled, from light to dark brown at maturity, straight.

Asexual morph not observed.

Colony description: growing on MEASW, reaching 42 mm Ø after 28 days at 21° C, mycelium feltrose with irregular edges, whitish with slight shades of purple in the middle, grey-green at the edges; reverse caramel. A caramel colored diffusible pigment and exudates often present.

Key to species in the genus: N/A

Image: 28-days-old colony incubated at 21 °C on MEASW (A) and reverse (B); ascoma (C), clavate young ascus (D, red arrow); mature asci in the ascoma (E), transversal section of asci with ascospores (F, red arrow). Scale bars 20 µm (C, E, F), 10 µm (D).

Image based on Poli et al. (2020) Frontiers Microbiol 11 (933): 9 (2020)

• 
  Fig 1