Marasmius siccus, or orange pinwheel, is a small orange mushroom in the Marasmius genus, with a "beach umbrella"-shaped cap. The tough shiny bare stem is pale at the top but reddish brown below, and the gills are whitish. The stem is 3-7 cm tall and the cap is 0.5-2.5 cm wide. At a microscopic level, the club-shaped spores are very long and thin, being roughly 19 µm by 4 µm. The distinctive cheilocystidia are broadly club-shaped with finger-like protrusions at the far end. Such cells also sometimes occur in other related mushrooms and they are known as "broom cells of the siccus type". This mushroom is found in hardwood forests from the Rocky Mountains to the Appalachian Mountains and also in northern Europe and Asia. Although nonpoisonous, they are too small to be considered worthwhile as food.
No narrative description available for this taxon yet.
A DNA barcode is a short, standardised stretch of genes that works like a fingerprint — enough to tell one species from another. Below is the molecular trace Marasmius siccus has left across the world's sequence archives.
At a glance
DNA specimens12
Marker genes2
GenBank sequences10
eDNA detections22
Countries4
The DNA barcodea real sequence read deposited for this species
★ the standard DNA barcode for this group — the short region actually read to tell this species apart. The rest are extra genes sequenced along the way.
★ITS10★ITS1
fungal barcode
07Deep time~1.65 Ma lineage
How far back this lineage goes — and how we know. Everything here is measured in Ma, short for “mega-annum”: millions of years ago. The chart reads left to right like a calendar of the Earth, from the deep past on the left to today at the right edgetop to bottom like a core drilled through the Earth, from the deep past at the top down to today at the bottom.
At a glance
DNA clock origin1.65 Ma TimeTree
When this lineage existed
How to read this: the coloured strip along the bottomdown the left is the geological calendar — the standard epochs (Pliocene, Pleistocene…) every museum uses, shown so you can see which chapter of Earth's history this lineage lived in. This lineage is a young one, so the strip is zoomed in to epochs — the finer subdivisions inside a period. The orange marker is the DNA clock: DNA accumulates mutations at a roughly steady rate, so comparing this species' DNA with its relatives estimates when the lineage split off — independently of any fossil.
DNA clock origin
08Occurrence & distribution
Record type2 323 records
Wild obs. + sensor1 669
Museum / vouchered649
Other5
Range
Area of Occupancy AOO6 988 km²
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
Coordinate accuracy78% within 1 km
≤100 m 679≤1 km 293≤10 km 160>10 km 117
1 249 georeferenced · 420 without coordinates
Open the mapobservation + sensor1 669
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
Coordinate accuracy39% within 1 km
≤100 m 48≤1 km 93≤10 km 171>10 km 49
361 georeferenced · 288 without coordinates
Open the institutions mapphysical evidence649
Wildobservation + sensor
Human sightings and records, or camera-trap / sensor detections — someone (or a device) saw or captured the species in the wild.
10Collections & institutions
Holding institutions30 of 55 geolocated
Institutions and collections holding physical, vouchered specimens of this species — click a row to fly to it on the map.
Institution
Specimens
Bronx, US
87
TENN-Flocation not on record
56
Bernard Price Institute for Palaeontological Researchlocation not on record
47
Chicago, US
39
Oulu, FI
30
Davis and Elkins Collegelocation not on record
23
WTUlocation not on record
21
Ann Arbor, US
21
St. Paul, US
20
Olocation not on record
18
Catholic University of Pekinglocation not on record
16
Champaign, US
15
ILLSlocation not on record
15
Toronto, CA
14
Chapel Hill, US
13
Helsinki, FI
11
Université de Montréal Biodiversity Centrelocation not on record
11
TROMlocation not on record
10
Tomioka, JP
10
Osaka, JP
8
National Institute of Biological Resourceslocation not on record
8
FLASlocation not on record
7
Trondheim, NO
7
Copenhagen, DK
7
Uppsala, SE
7
Durham, US
6
Odawara, JP
6
Chiba, JP
6
Colorado State Universitylocation not on record
6
SLU Artdatabankenlocation not on record
6
PHlocation not on record
5
Pullman, US
4
Cincinnati, US
4
Blacksburg, US
4
Bando, JP
4
Denver, US
4
Lincoln, US
3
Tromso University Museumlocation not on record
3
Madison, US
3
Acadia Universitylocation not on record
2
Grupo Actinomicetales Merida Facultad de Medicinalocation not on record
2
Nagatoro-machi, Chichibu-gun, JP
2
Durango, MX
2
Universidad de los Llanos (UniLlanos)location not on record
2
National Mushroom Centre, Department of Agriculture, Ministry of Agriculture and Livestock, Bhutanlocation not on record
2
Clemson, US
1
Mexico City, MX
1
McWane Science Centerlocation not on record
1
nsnflocation not on record
1
UESBlocation not on record
1
Rene Pomerleau Herbariumlocation not on record
1
IB FRC Komi SC UB RASlocation not on record
1
Brown Universitylocation not on record
1
Guatemala City, GT
1
Ciudad de México, MX
1
55 institutions · 607 of 649 vouchered records shown · 42 without an institution code
09Environmental DNA22 detections
Where the DNA of Marasmius siccus was picked up in samples of water, soil or air — nobody saw the organism, only its DNA left behind. A trace is a clue that the species was near, not a confirmed sighting.
Signal
Detections DNA found22
Studies independent surveys2
Countries4
Signal confidence: moderateweighed across independent studies, places & mapped detections
Where its DNA was found
0 of 22 detections have coordinates
Open the map4 countries0
mixed birch-willow forestExclos (presence de sapin)
How strong is each trace?
DNA read depthRead counts were not reported for this species — the map shows presence only, not how strong each trace was.
Modelled climatemodelled
−15°Ctemperature across detection sites+40°C
Temperature median10.1 °C 5.40–10.6
Seasonal swing summer↔winter34.7 °C
Max temp (day)11.9 °C 9.80–15.8
Min temp (night)4.90 °C 0.7–6.30
Precipitation80.4 mm/mo 49.7–89.0
Air humidity59.6 % 55.3–64.3
Moisture balance-0.7 mm/mo -20.5–7.70
Vapour deficit445 Pa 401–515
Wind speed2.90 m/s 2.10–4.90
Cloud cover50.9 % 33.1–63.4
CHELSA 1981–2010, ~9 km grid, at location & month of 14 detection points · median with p10–p90 · reflects where sampling happened, not only the true niche
How to read this: each dot is one detection of this species' DNA in an environmental sample. The confidence meter weighs how many independent studies and places back up the signal — one detection in one study is a hint; many across several studies is solid. Records dated before 2008 (when eDNA methods began) are treated as likely mislabeled and left off the map.
WikipediaWikimedia Foundation1 languages↗
GBIFGlobal Biodiversity Information Facility2 323 records↗
ENAEuropean Nucleotide Archive · EMBL-EBI22 eDNA detections↗
BOLD SystemsCentre for Biodiversity Genomics12 specimens↗
NCBIUS National Library of Medicinesequences↗
Open Tree of LifeOpenTreephylogeny backbone↗
GLoBIGlobal Biotic Interactionsbiotic interactions↗