Coll. TUR-A 190721
© M. Carbone | | | | | |
Helvella rivularis Dissing & Sivertsen, Bot. Tidsskr., 75 (2-3): 101 (1980).
Basionym Helvella rivularis Dissing & Sivertsen, Bot. Tidsskr., 75 (2-3): 101 (1980).
Diagnosis Carposomata solitaria, saepe 10-20 congregata. Pileus juvenis compressus, adultus cupulatus vel discoides vel plane expansus, 0.4-1.8 cm latus hymenio vivo canescenti-fusco vel atro-canescente, extra conspicue villosus, eodem ut hymenio colore vel magis canescens; stipes 0.2-1.5 cm altus, 1-2 mm crassus, solidus, cylindricus vel sensim in pileum incrassatus, conspicue villosus, eodem ut extra pileo colore. Excipulum exterius 200-230 µm crassum, textura angulata vel prismatica, cellulis superficialibus cylindricis vel tympaniformibus vel clavatis, hyphas formantibus laxe dispositas, interdum conspicue fasciculatas. Excipulum medullare 330-370 µm crassum, e hyphis septatis, ramificatis, 3-4 µm crassis, dense intertextis formatum. Subhymenium 40-70 µm crassum. Hymenium 290-330 µm altum. Asci operculati, cylindrici, 13-16 µm crassi, in bases satis crassas, aporhynchas velpleurorhynchas sensim transeuntes. Paraphyses rectae, paucis septis divisae, 3-4 µm crassae, apice ad 8-9 µm incrassatae. Sporae glabrae, hyalinae, forma et magnitudine satis variae, ellipsoides, 17.8-19.3-20.5 × 10.6-11.3-13.2 µm magnae, uniseriatae, plerumque guttulas magnas centralas singulas continentes.
Holotypus die 7 Septembris anni 1972 inter muscos hygrophilos arenam calcariam in alveo uvido rivuli praecipitis Tørrbekken aestate aqua carentis tegentes prope vicum Krokstrand tractus Ranani regionis norvegicae Nordland sub numero MO 72.95 ab auctoribus lectus, siccus in Herbario Nidrosiano (TRH) depositus, isotypo in Museo Botanico Hauniensi ©.
Type MO 72.95 (TRH) - holotypus
MycoBank 112350
Literature
Abbott S.P., Currah R.S. 1997. The Helvellaceae: systematic revision and occurrence in Northern and Northwestern North America. Mycotaxon, 62: 1-125.
Carbone M. 2011. Contributo alla conoscenza di Helvella rivularis, una specie critica e poco conosciuta della sez. Macropodes. Mycologia Montenegrina, 13: 7-39.
Dissing H., Sivertsen S. 1980. Operculate Discomycetes from Rana (Norway). 3. Helvella rivularis sp. nov. Botanisk Tidsskrift, 75 (2-3): 101-104.
Medardi G. 2011. Due Helvella poco comuni sul territorio italiano: H. latispora e H. rivularis. Mycologia Montenegrina, 13: 79-90.
Skrede I., Carlsen T., Schumacher T. 2017. A synopsis of the saddle fungi (Helvella: Ascomycota) in Europe – species delimitation, taxonomy and typification. Persoonia, 39: 201-253.
Van Vooren N. 2014. Notes sur le genre Helvella L. (Ascomycota, Pezizales). 2. Les sous-genres Cupuliformes et Macropodes. Bulletin mycologique et botanique Dauphiné-Savoie, 212: 29-47.
Classification: Helvellaceae, Helvella
Created on 08/07/2015.
Updated on 03/08/2023.
