Common Hawthorn

In Great Britain and/or Ireland:
Plant / associate
fruitbody of Agaricus campestris var. equestris is associated with Crataegus monogyna
Other: minor host/prey

Foodplant / internal feeder
larva of Anomoia purmunda feeds within fruit of Crataegus monogyna
Other: major host/prey

Plant / associate
Anthocoris gallarum-ulmi is associated with aphid-galled leaf of Crataegus monogyna

Foodplant / sap sucker
adult of Atractotomus mali sucks sap of Crataegus monogyna
Remarks: season: late 6-early 8

Foodplant / saprobe
fruitbody of Basidiodendron rimosum is saprobic on dead, decayed wood of Crataegus monogyna

Foodplant / feeds on
adult of Bruchus loti feeds on pollen? of Crataegus monogyna
Remarks: season: (1-)summer(-12)

Plant / associate
adult of Campyloneura virgula is associated with Crataegus monogyna
Remarks: season: 7-10
Other: major host/prey

Plant / associate
fruitbody of Clavulinopsis umbrinella is associated with Crataegus monogyna
Other: minor host/prey

Foodplant / mycorrhiza
fruitbody of Coltricia confluens is mycorrhizal with live root of Crataegus monogyna
Remarks: Other: uncertain

Foodplant / mobile cased feeder
larva of Cryptocephalus coryli grazes in mobile case on fallen leaf of Crataegus monogyna
Remarks: captive: in captivity, culture, or experimentally induced

Plant / resting place / on
adult of Cryptocephalus frontalis may be found on Crataegus monogyna
Remarks: season: 5-8
Other: major host/prey

Foodplant / visitor
adult of Cryptocephalus nitidulus visits for nectar and/or pollen flower of Crataegus monogyna
Remarks: season: early 5-9

Foodplant / sap sucker
Deraeocoris olivaceus sucks sap of berry (young) of Crataegus monogyna

Foodplant / sap sucker
Dysaphis crataegi sucks sap of live Crataegus monogyna

Foodplant / parasite
fruitbody of Entoloma clypeatum parasitises live root of Crataegus monogyna
Remarks: season: 4-6
Other: major host/prey

Foodplant / parasite
fruitbody of Flammulina velutipes var. lactea parasitises living wood of Crataegus monogyna

Foodplant / saprobe
fruitbody of Flammulina velutipes var. velutipes is saprobic on dead wood of Crataegus monogyna

Foodplant / gall
aecium of Gymnosporangium clavariiforme causes gall of live, swollen petiole of Crataegus monogyna
Remarks: season: 7-9+
Other: major host/prey

Foodplant / gall
aecium of Gymnosporangium confusum causes gall of live fruit of Crataegus monogyna
Other: major host/prey

Plant / associate
fruitbody of Lepista saeva is associated with Crataegus monogyna

Foodplant / saprobe
fruitbody of Micromphale foetidum is saprobic on dead, fallen, decayed stick of Crataegus monogyna

Foodplant / feeds on
adult of Orsodacne cerasi feeds on anther of Crataegus monogyna
Remarks: season: 4-9

Foodplant / feeds on
adult of Orsodacne humeralis feeds on pollen? of Crataegus monogyna
Remarks: season: 3-6
Other: major host/prey

Foodplant / saprobe
fruitbody of Peniophora boidinii is saprobic on dead wood of Crataegus monogyna

Foodplant / parasite
fruitbody of Phellinus ferreus parasitises living trunk of Crataegus monogyna
Other: major host/prey

Foodplant / saprobe
fruitbody of Phellinus ferruginosus is saprobic on dead wood of Crataegus monogyna
Other: minor host/prey

Foodplant / saprobe
fruitbody of Phellinus pomaceus is saprobic on dead Crataegus monogyna

Foodplant / saprobe
fruitbody of Phellinus punctatus is saprobic on dead, standing trunk of Crataegus monogyna

Foodplant / parasite
fruitbody of Phlebiella bourdotii parasitises live trunk of Crataegus monogyna

Foodplant / saprobe
fruitbody of Phlebiella tulasnelloidea is saprobic on dead, decayed wood of Crataegus monogyna

Foodplant / parasite
mostly hypophyllous cleistothecium of Phyllactinia mali parasitises live leaf of Crataegus monogyna

Plant / associate
Physatocheila dumetorum is associated with lichen-covered branch of Crataegus monogyna

Foodplant / parasite
Podosphaera clandestina var. clandestina parasitises Crataegus monogyna

Foodplant / saprobe
fruitbody of Sistotremella perpusilla is saprobic on dead, decayed wood of Crataegus monogyna
Other: major host/prey

Foodplant / saprobe
fruitbody of Skeletocutis carneogrisea is saprobic on dead wood of Crataegus monogyna
Remarks: Other: uncertain

Foodplant / saprobe
fruitbody of Terana caerulea is saprobic on dead, decayed wood of Crataegus monogyna
Other: minor host/prey

Foodplant / saprobe
fruitbody of Typhula spathulata is saprobic on dead, fallen, decayed wood of debris of Crataegus monogyna

Foodplant / hemiparasite
haustorium of Viscum album is hemiparasitic on branch of Crataegus monogyna
Other: major host/prey

Foodplant / saprobe
fruitbody of Volvariella bombycina is saprobic on dead stump (large) of Crataegus monogyna

Foodplant / saprobe
fruitbody of Vuilleminia cystidiata is saprobic on dead, decorticate, attached branch of Crataegus monogyna
Other: major host/prey