Morchella dunalii

Morchella dunalii is a species of fungus in the family Morchellaceae (Ascomycota). A widespread species in the Mediterranean basin, M. dunalii is so far known from the Balearic islands, the islands of Corsica and Cyprus, France, Spain and Turkey, where it appears to be abundant. It fruits very early in the season on calcareous soil, usually in association with the Aleppo pine (Pinus halepensis), Calabrian pine (Pinus brutia) and holm oak (Quercus ilex).

Morchella dunalii
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Pezizomycetes
Order: Pezizales
Family: Morchellaceae
Genus: Morchella
Species:
M. dunalii
Binomial name
Morchella dunalii
Boud. (1887)
Synonyms
  • Morchella fallax Clowez & Luc Martin (2012)

Taxonomy and phylogeny

Morchella dunalii was described with a watercolour plate in 1887 by French mycologist Emile Boudier, based on a collection from the Montpellier area.[1] For unknown reasons, Boudier did not include M. dunalii in his 1897 monograph[2] and the species remained very poorly known, not appearing in any of the popular literature or monographic works on the genus. The revival of the name is owed to Moreau and colleagues, who in 2011 designated a lectotype based on the original watercolour painting of this forgotten taxon, discovered in the archives of Pôle Patrimoine scientifique of the University of Montpellier.[3] Subsequent molecular phylogenetic studies by Richard and colleagues in 2014[4] matched this taxon to phylogenetic lineage Mel-25, previously detected by Taşkın and colleagues,[5][6] and designated an epitype.

A 2016 study by Loizides and colleagues[7] provided a detailed description, as well as notes on the ecology and distribution of M. dunalii, which appears to be the most common and widespread morel in the Mediterranean region, frequently misidentified as M. conica, M. deliciosa, M. purpurascens,[8] or M. rielana.[9]

Phylogenetically, M. dunallii is the sister species of M. kakiicolor.[10] The taxon Morchella fallax, proposed by Clowez in 2012,[9] is a later synonym of this species.[4]

Description
Immature fruit bodies with uniformly pale colours.
Mature fruit bodies with darkening ridges.

Morphology

The fruit bodies are medium-sized to large, fleshy and have a short stipe proportionately to the cap, which is often submerged into the substrate. The cap is 4–8(–10) cm high by 2–5(–8) cm wide, broadly conical, cylindrical or ovoid, pale beige, buff, or olivaceous-buff when immature, gradually darkening to grayish-brown or olivaceous-gray. It is attached to the stipe with a broad, rounded sinus. The longitudinal primary ridges are moderately spaced to dense, thick, glabrous and partially anastomosed, at first the same colour as the pits, but gradually becoming pinkish-purple, sepia and finally black in full maturity, creating a sharp contrast with the pits which usually remain pale. There are numerous interconnecting ridges forming multiple sunken pits. The pits are distinctly rounded to somewhat elongated and more or less vertically arranged. The stipe is typically short, 2–4(–8) by 1.5–3(–4) cm, more or less cylindrical, weakly wrinkled and inflated at the base. The flesh is thick, with a strong, sweet odour.[7][11]

The ascospores are rather small, measuring (17–)17.5–23(– 26) × (10.5–)11–15(–16) μm, broadly elliptical to elliptical, hyaline (translucent) and appearing smooth under a light microscope, but when viewed in lactophenol cotton blue or under a scanning electron microscope, they are faintly roughened. The asci (spore-bearing cells) measure 250–400 × 15–22 μm, are cylindrical to clavate, have eight spores and often an enlarged, rounded or clavate base.

Ascospores as seen under a light microscope.

The paraphyses measure 135–200 × 13–20 μm, are cylindrical to clavate or sometimes moniliform, have 2–3(–4) septa and variously shaped and frequently enlarged tips sometimes up to 30–40 μm. The acroparaphyses (cells on the sterile ridges) measure 65–145 × 18–30(–40) μm, are clavate, capitate, subcapitate or pear-shaped, fasciculate and have 2–3 septa. The stipe surface is composed of variously sized catenulate elements, with scattered clavate to subcapitate terminal elements measuring 55–110 × 5–25 μm.[7][12][11]

Similar species
  • Morchella deliciosa is similar to M. dunalii, but produces more acutely conical fruit bodies with anastomosed or flexuous primary ridges forming elongated and angular primary pits. Microscopically, it has markedly slimmer, cylindrical, papillate to subcapitate acroparaphyses up to 9–12.5 μm wide and larger spores measuring 23–27 × 12.5– 16 μm. It is usually found in high elevation forests of Larix, Picea and Pinus.
  • Morchella kakiicolor, so far known only from the Canary islands and Spain, produces long and slender fruit bodies with more or less ladder-like secondary ridges. Microscopically, it has more slender, cylindrical paraphyses up to 20–25 μm wide, and shorter terminal elements on the stipe measuring 15–75 × 8–22 μm.

Edibility

Like all morel species, Morchella dunalii is edible and choice, provided it is thoroughly cooked.[8]

Ecology and distribution

Morchella dunalii is widespread in the Mediterranean basin but absent elsewhere. So far, its presence has been phylogenetically verified in the Balearic islands,[11] Corsica,[4] Cyprus,[7] France,[4] Spain[4] and Turkey.[5] It is one of the first morels to appear early in the season, fruiting solitary or in small groups in late winter or early spring with a strong preference for calcareous soils. Although its trophic status is not yet known with certainty, it is strongly suspected to be a biotroph and regularly fruiting under specific trees and shrubs. Most frequently associated tree species include the Aleppo pine (Pinus halepensis), the Calabrian pine (Pinus brutia), and holm oaks (Quercus ilex).[7][13][11]

References
  1. Boudier E. (1887). "Notice sur les discomycètes figurés dans les dessins inédits de Dunal conservés à la Faculté de Montpellier". Bulletin de la Société Mycologique de France (in French). 3: 88–96, pl. 8.
  2. Boudier E. (1897). "Révision analytique des morilles de France". Bulletin Trimestriel de la Société Mycologique de France. 13: 130–150.
  3. Moreau P-A, Hériveau P, Bourgade V, Bellanger J-M, Courtecuisse R, Fons F, Rapior S (2011). "Redécouverte et typification des champignons de la région de Montpellier illustrés par Michel-Félix Dunal et Alire Raffeneau-Delile". Cryptogamie, Mycologie (in French). 32 (3): 255–276. doi:10.7872/crym.v32.iss3.2011.255. S2CID 85671801.
  4. Richard F, Bellanger JM, Clowez P, Hansen K, O'Donnell K, Urban A, Sauve M, Courtecuisse R, Moreau PA (2015). "True morels (Morchella, Pezizales) of Europe and North America: evolutionary relationships inferred from multilocus data and a unified taxonomy". Mycologia. 107 (2): 359–382. doi:10.3852/14-166. PMID 25550303.
  5. Taşkın H; Büyükalacaa S; Doğan HH; Rehnerc SA; O'Donnell K (Aug 2010). "A multigene molecular phylogenetic assessment of true morels (Morchella) in Turkey". Fungal Genetics and Biology. 47 (8): 672–682. doi:10.1016/j.fgb.2010.05.004. PMID 20580850.
  6. Taşkın H, Büyükalaca S, Hansen K, O'Donnell K (2012). "Multilocus phylogenetic analysis of true morels (Morchella) reveals high levels of endemics in Turkey relative to other regions of Europe". Mycologia. 104 (2): 446–461. doi:10.3852/11-180. PMID 22123659. S2CID 207685509.
  7. Loizides M, Bellanger J-M, Lowez P, Richard F, Moreau P-A (2016). "Combined phylogenetic and morphological studies of true morels (Pezizales, Ascomycota) in Cyprus reveal significant diversity, including Morchella arbutiphila and M. disparilis spp. nov". Mycological Progress. 15 (4): 39. doi:10.1007/s11557-016-1180-1. S2CID 15163613.
  8. Loizides M, Kyriakou T, Tziakouris A (2011). Edible & Toxic Fungi of Cyprus (in Greek and English). Published by the authors. pp. 122–23. ISBN 978-9963-7380-0-7.
  9. Clowez P. (2012). "Les morilles. Une nouvelle approche mondiale du genre Morchella". Bulletin de la Société Mycologique de France (in French). 126 (3–4): 199–376 (see p. 238).
  10. Loizides M, Alvarado P, Clowez P, Moreau P-A, de la Osa LR, Palazon A (2015). "Morchella tridentina, M. rufobrunnea, and M. kakiicolor: a study of three poorly known Mediterranean morels, with nomenclatural updates in section Distantes". Mycological Progress. 14 (3): 13. doi:10.1007/s11557-015-1030-6. S2CID 16132175. Archived from the original on 2021-01-31. Retrieved 2021-01-31.
  11. Marcos Martinez J, Mir G, Marques G (2021). "El género Morchella Dill. ex Pers. en Illes Balears". Micobotánica-Jaén. XVI (1): 1–39.
  12. Clowez P, Moreau PA (2018). "Les spores de morilles en microscopie optique". Documents Mycologiques (in French). 37: 23–38.
  13. Loizides, M. (2017). "Morels: the story so far". Field Mycology. 18 (2): 42–53. doi:10.1016/j.fldmyc.2017.04.004.
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