Sunday, January 21, 2018

[Fungi • 2018] Genetic Diversity of the Genus Terfezia (Pezizaceae, Pezizales): New Species, Terfezia crassiverrucosa, and New Record from North Africa

Terfezia crassiverrucosa  
  Zitouni-Haouar, G. Moreno, Manjón, Fortas, & Carlavilla

in Zitouni-Haouar, Carlavilla, Moreno, Manjón & Fortas, 2018


Morphological and phylogenetic analyses of large ribosomal subunit (28S rDNA) and internal transcribed spacer (ITS rDNA) of Terfezia samples collected from several bioclimatic zones in Algeria and Spain revealed the presence of six distinct Terfezia species: T. arenaria, T. boudieri, T. claveryi; T. eliocrocae (reported here for the first time from North Africa), T. olbiensis, and a new speciesTerfezia crassiverrucosa sp. nov., proposed and described here, characterized by its phylogenetic position and unique combination of morphological characters. A discussion on the unresolved problems in the taxonomy of the spiny-spored Terfezia species is conducted after the present results.

Keywords: desert truffles, Pezizaceae, phylogeny, taxonomy, Fungi

FIGURE 2. Macro- and microscopic characters of Terfezia crassiverrucosa.
a. ascocarp collected under Helianthemum hirtum. b. gleba, cross section. c,d. asci with spores. e–h. ascospores (f–h. scanning electron micrograph).

Bars: a–b = 1 cm, c–d = 10 µm, e = 5 µm, f–g = 5 µm, h = 2 µm.

Terfezia crassiverrucosa Zitouni-Haouar, G. Moreno, Manjón, Fortas, & Carlavilla, sp. nov.  

  Diagnosis:— Ascomata hypogeous, subglobose, substipitate with short basal attachment, <8 cm broad (Fig. 2a). Peridium smooth, light to dark brownish, 100–200 µm thick with emergent hyphae 6–10 µm broad at septa, pseudoparenchymatous, composed of subglobose, polygonal to irregularly oblong cells (9–) 12.5–38 × 15–60(–62) µm, with cell walls 1–2 µm thick. Gleba solid, fleshy, light pink to pale yellow with subglobose to elongate light pink to pale gray pockets of fertile tissue, separated by light yellow to pale orangish yellow sterile veins (Fig. 2b). Asci (4–6)–8– spored, hyaline, often ellipsoid to ovoid or at times subglobose, 51–60 × 60–81 µm, nonstalked (Fig. 2 c & d). Ascospores globose, first hyaline, turning light yellowish to bright orange with age, measuring (16–) 17–21 (–24) µm in diameter including ornamentation, consisting in more or less broad flat truncate to round-tipped warts (0.5–) 1–1.5 × 2–4.5 (– 6) µm, and relatively elongated rounded elements measuring 1–1.5 × 1.5–3 µm. The prominent, crowded ornamentation hides a fine reticulum on the spore surface formed between the warts (Fig. 2 c–h).

Etymology:— The epithet (Latin crassiverrucosa) refers to the large warts covering the spore surface of this species. 

Habitat:— Algerian arid area. In high steppe plains south of Constantine (Chrea, Tebessa), associated with Helianthemum sp. In high steppe plains south of Algiers (Bouchouat, Tiaret), found under Helianthemum hirtum and H. salicifolium associated mostly with Stipa parviflora on sandy loam alkaline soil, in sites also producing T. claveryi and T. eliocrocae. March, April.

 Fatima El-Houaria Zitouni-Haouar, Juan Ramón Carlavilla, Gabriel Moreno, José Luis Manjón and Zohra Fortas. 2018. Genetic Diversity of the Genus Terfezia (Pezizaceae, Pezizales): New Species and New Record from North Africa. Phytotaxa.  334(2); 183–194.  DOI: 10.11646/phytotaxa.334.2.7 

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