Porpopycnis lubae
Porpopycnis lubae R. Kirschner 2012, in Kirschner et al., Mycological Progress ,11(2), 563 (2012).
Etymology: Derived from the nickname “Luba” cordially dedicated to Liuba Kisimova-Horovitz (deceased on 29. March 2011) because of her personality and merits in neotropical mycology.
Diagnosis: Pycnidia superficial, conical with elongated neck when mature, when fresh gelatinous, with a shiny mucoid droplet of conidia at the apex, white, yellow-orange when dried, 680–2,000×600–720 μm, with a single locule. Ostiole apical on the rostrate apex, single, obtuse, not fimbriate. Lateral pycnidial wall 72–132 μm thick, composed of several layers of irregularly interwoven, hyaline, smooth, 1- to 1.5-μm-wide hyphae with mainly longitudinal orientation. Dolipore septa of hyphae with continuous parenthesomes. Conidiophores arising from 1.5 to 2 μm wide, slightly thick-walled, anastomosing hyphae at the base and along the inner pycnidial wall, rarely branched and then only at the base, 1- to 2-septate, 65–140×2–3 μm. Conidiogenous cells cylindrical, slightly undulate, with inconspicuous apical annellations rarely visible with the light microscope, 43–75×2–3 μm. Conidia hyaline or white in mucoid mass, one-celled, smooth, thin-walled, obovoid to pyriform, sometimes somewhat asymmetrical, without appendages, (11–)12–14(−15)×(7–)8–9(−10) μm (n=30), narrowing to a 2- to 3-μm-wide base. Conidia in some cases containing a conspicuous large droplet, cell walls multilayered as seen by TEM.
Index Fungorum Number: IF582727
Figure 1. Fresh pycnidia of Porpopycnis lubae on rotten wood (RoKi 2745). Scale bar 5 mm (Photo: Kirschner et al., 2012)
Figure 2. Cellular structures of Porpopycnis lubae (RoKi 2745). a Sketches of pycnidia on the substrate, scale bar 1 mm. b Pycnidia in longitudinal section, scale bar 1 mm. c Longitudinal section through pycnidial wall from inner (left) to outer (right), scale bar 10 μm. d Conidiophores, scale bar 20 μm. e Two conidiogenous cells, the left one with developing conidium, the right one with apical annellations, scale bar 10 μm. f Conidia, scale bar 10 μm (Photo: Kirschner et al., 2012)
Figures 3–8. Ultrastructural characteristics of Porpopycnis lubae (RoKi 2745). a Median section through a dolipore with continuous parenthesomes, scale bar 0.1 μm. b Conidium with a large droplet, scale bar 2 μm. c Base of conidium from (b) apparently still attached to the apex of a collapsed conidiogenous cell, scale bar 0.5 μm. d Base of a detached conidium showing the multilayered cell wall, scale bar 0.5 μm.
(Photo: Kirschner et al., 2012)
Figure 4. Unrooted neighbor-joining tree inferred from partial nuc LSU rDNA sequences of selected Agaricomycotina showing the placement of Porpopycnis lubae in the Auriculariales (uppermost clade) (Photo: Kirschner et al., 2012)
Reference:
Kirschner, R., Lee, I.S., & Piepenbring, M. (2012). A new pycnidial fungus with clamped hyphae from Central America. Mycological progress, 11, 561-568.
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