Particularly

This is one of the 117 mis-spellings listed as 'Common difficulties' in the section on 'Spelling' within 'Writing' in UEfAP.

Particularly causes some writers problems with spelling because of the way it is pronounced. In casual speech, the last three syllables are slurred in various ways, sometimes leaving only two: 'part-ick-er-ly', IPA: /pə^r ˈtɪk ə lɪ/. Pedantic speakers articulate five syllables, and distinguish between the consonants '-r-' and '-l-'. They also form the vowel '-u-' with precision, This gives 'par-TICK-you-lar-ly', /pa^r ˈtɪk uːl ə^r lɪ/. The most usual RP realization falls between these two, with looser vowels: 'per-TICK-you-ler-li', /pə^r ˈtɪk uːl ə^r lɪ/ (as recorded in LPD).

• In writing. note:

there are two '-a-' plus '-r-' combinations, in the first and fourth syllables; and 
       there is a '-u-' in the the third syllable

You may also want to see AWE's articles on particular.

Dickens also, it may be noted, used the spelling particklerly to represent the colloquial speech of his less educated characters. Other writers have used this spelling, as well as partickerly.