The Collaborative International Dictionary of English v.0.48:

Stalagmitic \Stal`ag*mit"ic\ (st[a^]l`[a^]g*m[i^]t"[i^]k),
Stalagmitical \Stal`ag*mit"ic*al\ (-m[i^]t"[i^]*kal), a.
   Having the form or structure of stalagmites. --
   Stal`ag*mit"ic*al*ly, adv.
   [1913 Webster]