Due to the sheer number of named aberrations for some species, not all are shown on the species pages - only those for which corresponding images are available. This page, however, provides access to all of the named aberrations for a given species, where known and Goodson & Read (1969) is a key resource in this regard.
Aberration in this species is usually expressed in either the upperside ground colour (particularly in the female), and the shape and size of the silver spots on the underside. Aberration is generally rare in this species, although different individuals do often vary in the shade of the underside ground colour. In recent years the aberration juncta (Tutt) has been seen on a number of occasions at a site in Hampshire. This aberration is probably caused by a simple recessive gene. In hot summers, specimens with particularly dark upperside ground colour (see ab. suffusa below) have been known to occur with frequency on some sites, giving rise to speculation that this variation in colouration could be environmentally triggered. There are 13 named aberrations known to occur in Britain.
The dark parts and markings on all wings replaced by grey or siver-grey. Albino.
= guernisaci OberthÃ¼r.Lep.Comp.1910.4.p.361.,fig.Etudes 20.pl.6.f.86.
On the underside the white spots are obliterated by being suffused with dark scales, only one small clear central spot remains in the centre. Tutt and OberthÃ¼r described the same specimen. The figure in Etudes shows no sign of the one small, white central spot but OberthÃ¼r mentions it in his description.
Bright fulvous, almost unspotted (slight traces only towards the apex of the forewings), and the usual marginal border almost obsolete.
On the underside of the hindwings the outer white spots are united into a large zigzag mark.
On the underside of the hindwings the silver spots of the outer row are reduced to the three top ones with an indistinct fourth, the lower ones are obsolete.
Almost entirely fuscous, the spots much reduced on the forewings, almost absent on the hindwings.
On the underside the spots are yellow, almost lost in the ground colour and markedly obsolete.
The spots on the upperside of both fore and hindwings absent. On the underside the hindwings show just a trace of the spots.
Bright fulvous, the marginal border fuscous, the spotting on both fore and hindwings faint.
= faunula OberthÃ¼r.Lep.Comp.1910.4.p.361,fig.Etudes 20.pl.6.f.85.
On the underside of the hindwings the white spots are united into one large blotch so that only a pale shade remains in the centre. Tutt and OberthÃ¼r described the same specimen. OberthÃ¼r's figure shows all the white spots joined together to form a complete circle, the centre being pale brownish.
All wings with yellowish-bone ground colour as in the same form of sylvanus.
The ground colour suffused with fuscous as in ab. suffusa but the spots yellowish, even whitish, towards the apex of the forewings.
The ground colour suffused with fuscous, the fulvous being restricted to the angulated row of spots and the discal cell of the forewings, and the transverse row and discal spot of the hindwings.