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Alder (Alnus glutinosa)
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Mine in buds or twig bark [?-5] Bohemannia quadrimaculella 19
Mine a gallery in the leaves with linear frass filling only one third of mine [7+9-10] Stigmella alnetella 115
Mine a gallery in the leaves frass dispersed or linear, filling two thirds of the mine;
larvae with dark prothoracic plate [7+9-10]
Stigmella glutinosae 114
N.B. Extreme forms of each mine should be easy to determine, but mines of an intermediate form could belong to either species. Tenanted mines should present no problem, but the dark prothoracic plate is not always easy to see.
Mine in midrib, inconspicuous, then into a lateral vein and across leaf back into midrib
finally cutting out a hole in leaf blade approximately 5 x 3mm [6-9
Heliozela resplendella 156
Mine long, narrow almost filled with black linear frass beside a vein, later the larvae leaves the mine from upperside and eats out windows from the underside of the leaf
Bucculatrix cidarella 272
N.B. early mine can be confused with that of a Nepticulidae, but egg matt black and rough in appearance.
1 Mine on upperside of leaf
  Mine on underside of leaf 3
2 Mine suboval contracting into a tube, upper cuticle silvery, flecked with brown frass, later the larva feeds in a rolled leaf [6-7] Caloptilia elongella 282
  Mine subcircular with strong central crease, but remaining flat, cuticle pale green, sometimes discoloured brown, not flecked with brown frass [7+9-10] Phyllonorycter stettinensis 357
  (N.B. mines that do not have crease are hymenopterous)  
3 Mine on leaf margin about 10mm long with brownish lower cuticle. Larvae feeding later in folded leaf-edge [7-8]
Caloptilia falconipennella 289
  Mine usually away from leaf-margin and more than 10mm long; lower cuticle green; larvae mine throughout
4 Mine very large, extending from midrib almost to leaf margin; larva grey; pupa in a cocoon without frass in centre of mine [9-10]
Phyllonorycter froelichiella 358
  Mine smaller, not exceeding 20mm in length; larvae whitish 5
5 Pupae in a cocoon edged with frass, larva with pale greenish tinge [7+9/10] Phyllonorycter rajella 345
  Pupae in a cocoon not edged with frass 6
6 Always on Grey Alder; pupa usually in middle of mine [7+9-10] Phyllonorycter strigulaella 344
  Usually on other Alder species; pupa usually at one end of mine, larva with pale yellowish tinge [9-10] Phyllonorycter kleemannella 360

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