Review of preliminary assessment needs to focus on the inference of distribution and population.
Since the description of Cantharellus ianthinoxanthus there have been some records of occurrence across Europe and into the Turkey. It may also have been recorded under other names, including C. melanoxeros. Without clearer data on the frequency of C. ianthinoxanthus across its habitat, it is difficult to assess the status of its population, but it given its likely wide distribution and under-recording, this may be relatively large.
Fagus sylvatica and Castanea sativa, key species thought to make up its habitat have also been assessed as Least Concern.
Under the assumptions that C. ianthinoxanthus has a large range, occurs in habitats associated with some widely distributed tree species, and therefore has a sizeable population, it is tentatively assumed that C. ianthinoxanthus may be of Least Concern.
Described by R. Maire as Cantharellus cibarius var. ianthinoxanthus in 1911 and as C. ianthinoxanthus by Kühner in 1947.
Index Fungorum also lists Craterellus ianthinoxanthus (Maire) Pérez-De-Greg as a synonym of C. ianthinoxanthus.
Chanterelle species to be assessed as part of the chanterelle comprehensive project.
The basionym Cantharellus cibarius var. ianthinoxanthus was described from France, and subsequent records under Cantharellus ianthinoxanthus and the synonym Craterellus ianthinoxanthus are available on GBIF from Slovenia, Germay, Switzerland, Spain and France.
Recent papers have identified C. ianthinoxanthus in Turkey and Poland (Sesli̇ et al, 2016; Hoffeins et al, 2017). However there is some caution over such records, as it has been considered to be a European endemic, predominantly from Central Europe, reaching across to the northern Iberian Peninsula (I. Olariage Ibarguren in litt. 2022), so such Turkish records would be disparate from the rest of the range. It has also been identified by mycological groups in Italy such as Il Gruppo Micologico di Pesaro, and Associazione Micologica Italiana Naturalistica Telematica.
Range extent is therefore uncertain but it can be inferred to occur across suitable habitat (particularly Beech forest) over a large swathe of Europe, although where reported it does not seem to be a common species.
The KML polygon file attached is a minimum inferred range of C. ianthinoxanthus based on existing occurrence data, and the widespread distribution of Fagus sylvatica in Europe, with an estimated area of 2,400,574 km2 (including sea cover). This range assumes a distribution for C. ianthinoxanthus that coincides with beech and other mixed forest. Global Forest Watch’s mapping data suggests forest and shrubland occurs across the inferred range with agricultural land widely interspersed in this area.
The GeoCat tool estimate for a minimum EOO and AOO using GBIF records and points representing records in Turkey and Poland is:
EOO - 2,400,574 km2
AOO - 280 km2
There is a lack of existing georeferenced occurrence data, but the existence of morphologically similar Cantharellus species such as C. melanoxeros across much of the inferred range suggests that some observations of C. ianthinoxanthus could have been wrongly identified as other species.
C. ianthinoxanthus appears to have a fairly wide distribution, and several associated tree species (Fagus sylvatica, Carpinus betulus and Castanea sativa). It may have had its records misattributed to other Cantharellus species, particularly C. melanoxeros. It is therefore tentatively assumed to have a larger, more widespread population than current occurrence data indicates.
Population estimates depend on the assumptions about the inferred range. Given the broad ranges of the above tree species thought to be associated with C. ianthinoxanthus and the existing distribution of records it can cautiously be assumed to occur across much of Europe and into the Turkey where appropriate habitat exists.
It is only seen in a few spots in all the localities where it is occurs, and is never abundant. Therefore estimating the likely number of unrecorded localities, or functional individuals per locality is uncertain. However, using F. sylvatica to indicate habitat and a series of broad assumptions based on the information available it is possible to assume that the population size is fairly large overall (i.e. above the thresholds for consideration as threatened).
Population trend is uncertain, due to a lack of spatio-temporal occurrence data for this species.
Population Trend: Uncertain
The basionym Cantharellus cibarius var. ianthinoxanthus was described from Fagus forest, with siliceous and siliceous clay soil, found summer to autumn (Maire, 1911). In general I occurs in well-preserved deciduous forests, on acid ground and in rainy areas, associated with Fagus and Quercus (I. Olariaga Ibarguren in litt. 2022).
A recent paper on Turkish C. ianthinoxanthus found them to be gregarious under Carpinus betulus and Castanea sativa (Sesli̇ et al, 2016)
The species is only known from well-preserved forest and does not occur in plantations, and so land conversion for agriculture, including silviculture, is assumed to impact this species.
Fagus sylvatica which appears to comprise the most widespread habitat of C. ianthinoxanthus, has been assessed as Least Concern. This species does face threats particularly from pests, diseases and climate change impacts such as drought, temperature extremes and storms. Carpinus betulus and Castanea sativa, which have been identified as habitat for the Turkish population of C. ianthinoxanthus are both also assessed as Least Concern, although Castanea sativa faces threats from logging/harvesting and forest management as well as similar threats as F. sylvatica.
Threats to such habitats could impact on C. ianthinoxanthus, but work is required to identify the extent of such threats.
An evaluation of its distribution, population, habitat and ecology is required to better assess this species.
Identifying whether occurrence records of C. ianthinoxanthus have been wrongly attributed to other species, and how widespread the species is across its associated habitat would help address the initial assumptions made in this assessment.
The basionym type description includes reference to the sweet flavour of this species.
Various mycological societies list C. ianthinoxanthus as edible.