a , Cladocarpus crenatus , F.; b , Aglaophenia pluma , L.; c , A. rhynchocarpa , A.; d , A cornuta , K.; e , A. ramulosa , K. requires separate description; we have already seen (p. 236 ) that this denticulation is in all probability due to a particular physical cause.
— from On Growth and Form by D'Arcy Wentworth Thompson
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