10.6092/issn.2531-7342/18530
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2531-7342
18530
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Arnold Knijn
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Italian Journal of Mycology
Corrigendum: A new species of <em>Agaricus</em> (section <em>Sanguinolenti</em>) from Rome, Italy
Text.Serial.Journal
https://italianmycology.unibo.it/
52
Errata
2024-01-22
2023-11-26
2023-02-08
2024-01-22
154-155
Ital J Mycol
Arnold Knijn
2023
10.6092/issn.2531-7342/18530
154
Via Arno 36, 00198 Roma, Italy
2531-7342
en
155
Ferretti, A., Saar, I., & Knijn, A. (2022). A new species of <em>Agaricus</em> (section <em>Sanguinolenti</em>) from Rome, Italy. Italian Journal of Mycology, 51(1): 1–10. https://doi.org/10.6092/issn.2531-7342/13464
Corrigendum: A new species of <em>Agaricus</em> (section <em>Sanguinolenti</em>) from Rome, Italy
https://italianmycology.unibo.it/article/download/18530/17473
52
                     IJM - Italian Journal of Mycology
                     ISSN 2531-7342 - Vol. 52 (2023): 154-155
                     Journal homepage: https://italianmycology.unibo.it/

Errata


                Corrigendum: A new species of Agaricus (section
                       Sanguinolenti) from Rome, Italy
                                   Amalia Ferretti1, Irja Saar2, Arnold Knijn1

1
    Via Arno 36, 00198 Roma, Italy.
2
    Institute of Ecology and Earth Sciences, University of Tartu, J. Liivi 2, 50409 Tartu, Estonia.

Corresponding author e-mail: knijn_roma@hotmail.com

A corrigendum on
Ferretti A, Saar I, Knijn A (2022) A new species of Agaricus (section Sanguinolenti) from Rome, Italy. Italian Journal of
Mycology 51:1-10. https://doi.org/10.6092/issn.2531-7342/13464
______________________________________________________________________________
ERRATA INFO
Received 26/11/23; accepted 07/12/23
https://doi.org/10.6092/issn.2531-7342/18530




________________________________________________________________________________

Recently, we realised we have committed an error in the published article “A new species of Agaricus
(section Sanguinolenti) from Rome, Italy” (Italian Journal of mycology, vol 51, pp. 1‒10). In the
article we described the new species Agaricus hortusdamarum A. Ferretti, I. Saar & A. Knijn based
on two separate findings. The manuscript was written after a single specimen found in November
2020 which was confirmed to be a new species by molecular analyses and afterwards results were
integrated upon the collection of five basidiomata in December 2021. After publication of the article,
molecular analyses on one of the specimens of the second finding, although found in the same
collection site and season and with a macroscopic appearance like the Agaricus hortusdamarum
holotype, identified it as Agaricus bisporus (J.E. Lange) Imbach.
       Although Figures 2a, c and e are from the A. hortusdamarum holotype, Figures 2b and d belong
to a specimen of A. bisporus. The molecular analysis described in the article remains valid as it treated
only the barcode sequence obtained from the holotype. Also, the macromorphological description
was compiled based upon the holotype with only slight modifications after the second finding. As
mentioned before, the macroscopic appearance of basidiomata of the two species was very similar;
the most marked difference was that for A. bisporus the white universal veil left appendiculate
remains along the entire circumference, while the A. hortusdamarum holotype had only some

                                                      ______________
    Department of Agricultural and Food Science in partnership with the Italian Mycological Society (UMI).
    The journal is hosted and maintained by ABIS-AlmaDL. © 2023 The Authors. This work is licensed under CC BY 4.0
Ferretti et al.
https://doi.org/10.6092/issn.2531-7342/18530                                            Italian Journal of Mycology 52 (2023): 154-155
___________________________________________________________________________________________________________________________________________________

remains. Furthermore, A. bisporus had a persistent marked good fungal smell, against the mild fungal
smell of A. hortusdamarum.
      Microscopic characters shown in Figures 5a and b are from the A. hortusdamarum holotype,
while Figures 5c, d and e were obtained from A. bisporus specimens. For the sake of clarity, we
repropose the Taxonomy section in toto, exclusively based upon the holotype specimen.

Taxonomy
Agaricus hortusdamarum A. Ferretti, I. Saar & A. Knijn, sp. nov.

Index Fungorum IF559484
Typification – Holotypus: Italy, Rome, Parco dei Daini, urban park, under Cupressus sempervirens,
41.916111°N, 12.493055°E, 14 Nov 2020, leg. Arnold Knijn, Amalia Ferretti (TUF105944, ITS
sequence UDB0799866).

Etymology – hortusdamarum is a compound noun created from the Latin words for park/garden
(hortus) of red deer (damarum, genitive plural), a translation of Parco dei Daini, where the holotype
was collected.

Macromorphology – Pileus convex then plane and depressed, diameter ~9 cm, reddish-brown,
squamulose, white trama exposed under the scales. The pileus margin slightly exceeded the lamellae,
appendiculate with remains of the universal veil. Lamellae free, crowded, intercalated with lamellule,
ventricular, at first pale, with age brown to dark brown. Stipe about 8.5 cm, cylindrical, central,
fistulose, greyish-white, with an evanescent disappearing greyish-white membranous annulus, with a
bulbous base covered with white mycelium. Stipe trama whitish, turning very slowly reddish brown
when handled or cut (Fig. 2c). Odour: slight fungal smell.

Micromorphology – Basidiospores (one basidioma, n = 32) smooth, ellipsoid, the major part with a
brown colouration, few of them with apiculum, lipid droplets and some granules were evident inside
(Fig. 5a). Their average size was 6.1 ´ 4.6 µm [(7.1)–6.1–(5.2) ´ (5.2)–4.6–(3.9) µm], Qm=1.3 Q=
[(1.5)–1.3–(1.2)]. Basidia bisporic and trisporic (Fig. 5b), 18–25 ´ 7–8 µm, with sterigmata up to 3.8
µm long (average 3.4 µm). Cheilocystidia abundant, hyaline, septate, cylindrical and clavate (Fig.
5a), single septated elements measuring 24–48 µm ´ 11–17 µm. Such cheilocystidia origin from the
lamellar trama, as was described for Agaricus iranicus Mahdizadeh, Safaie, Goltapeh, L.A. Parra &
Callac.

Habitat – On needle debris of pine and cypress, in urban park, autumn.

Distribution – So far only known from Italy.

Comments – Most similar to the closely related species A. iranicus. Agaricus hortusdamarum differs
in an evident although slow reddish-brown discoloration when touched, scraped and cutted the stem
surface and in cap with darker brown squamules. Microscopic evidence of larger cheilocystidia
supports the distinction between the two species. Both species grow in temperate environments but
A. iranicus presence is reported only in Asia and A. hortusdamarum is found in southern Europe. ITS
barcode: eight single-nucleotide variations occur between both species, two of which identified as
species-specific markers for A. iranicus.
      The discussion of the article remains valid as a whole since it only discussed results obtained
from the holotype. We would like to apologise for the inconvenience we have caused with this
regrettable error and state that this does not affect the validity of the new species in any way. The
original article has been updated.

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