Q is for Quercus

22 Monday Dec 2025

Posted by sconzani in fungi, insects, trees

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bugs on Oak trees, fungi on Oak tree, insects on Oak trees, Oak, Quercus species

As I know I’ve stated on this blog many times before, the various species of Oak tree (Quercus species) play host to a huge number of organisms of many types, forms, and colours. These are some I’ve been lucky to see this year: two species of fungus, the Oak mazegill (21 November) and Black bulgur (Fungi: Black bulgar, 24 October); several species of bug that have all featured in this update already (B is for bugs and beetles) but are worth another mention as they spend all or most of their lives on Oak trees: Cyllecoris histrionius, adult and nymph (12 May), Rhabdomiris striatellus (10 June), and Bug: Megacoelum infusum (12 September).

I also managed to find several Common quaker (Orthosia cerasi) caterpillars on a single Oak (included in Cool cats, 2, 5 June); the gorgeous lacewing shown above that has since been verified as Hemerobius micans and is found especially on mature oaks (Two lacewings, 4 September); the folded-over Oak leaf lobes created by a gall midge (Galls: Macrodiplosis pustularis, 2 June); and the stunning little Acorn weevil, shown below, that lives in Oak trees and lays its eggs inside acorns (Weevil: Curculio glandium, 1 August).

Rhabdomiris striatellus

10 Tuesday Jun 2025

Posted by sconzani in insects, trees

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British miridae, British plant bugs, bugs on Oak, insects on Oak trees, Miridae, oak tree, plant bug on Oak, Rhabdomiris striatellus

Here’s another bug that I’d never seen before this year and I’ve been lucky enough to find both a nymph and an adult. This is Rhabdomiris striatellus, one of the UK’s 200-plus species of plant bugs in the Miridae family. (I’ve probably only seen about a tenth of them so I’ve got plenty more discoveries yet to make.)

As this bug’s larvae feed on unripe catkins, it is usually found on or around Oak trees, and that’s certainly where I found the adult bug, shown below. The nymph above had probably fallen out of an Oak tree, or had decided to go walkabout to find a neighbouring Oak; I found it on the railings of my local park, where I’ve found so many invertebrates.

Rhabdomiris striatellus overwinters as an egg, hatches out in mid Spring, then passes through a series of instars until it reaches adulthood. The adults can then be seen from May through to July. Those timings certainly fit with my discoveries; I found the nymph on 25 April and the adult, in a different location, on 3 May.

Cyllecoris histrionius

21 Tuesday Jun 2022

Posted by sconzani in insects, leaves, trees

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British bugs, bugs on Oak leaves, Cyllecoris histrionius, insects on Oak trees, Miridae

It’s National Insect Week here in Britain so I thought I’d share a new bug I found while checking out life on the leaves of Oak trees. And if you think today’s bug looks a bit like last week’s bug, Leptopterna dolabrata, you’d be absolutely right. Meet Cyllecoris histrionius, another member of the Miridae family. This bug species overwinters as an egg, the larvae hatch in the Spring, then the adults are active from May to July. Oak leaves are their usual habitat; there they can be found munching away on aphids and other tiny insects.

220621 Cyllecoris histrionius