This base type is represented only by one morpho-lexical type:
The underlying Latin capanna is documented only once (in Isidore) according to FEW 2, 244–246 under capanna; "its origin is obscure" (FEW 2, 244 under capanna). The forms with -m- form an Alpine variant (cf. DRG 3, 236–239 under chamona). Regarding the semantics of the roh. forms it says: "The meaning 'hut, simple, meagre house' of the modern, literarily inclined form camona occupies an intermediate position between fam. baita DRG 2, 76 under baita) 'shack, dilapidated house, bad hut' and teja 'hut, Alpine hut' (cf. also fögler (239))."