Corms and Tunics
Crocus fleischeri corm: This species has tunics with interwoven fibres, which are the most netted in the genus and as such are a principal distinguishing feature
Crocus laevigatus corm: This species has a hard, coriaceous (eggshell like) corm tunic. The corms are distinctively shaped and relatively small. A thick hard tunic gives extra protection from drought.
Crocus hermoneus corm: A very large corm with parallel fibres, which are slightly netted at the top of the corm.
Crocus gilanicus corm: Example of a membranous or papery tunic and what might be thought of as a 'typical' corm shape. Thin tunics such as this often indicate species which come from relatively moist habitats.
Crocus abantensis corms: An example of reticulate (netted) corm tunic.
Crocus biflorus tunics (wild): Coriaceous (eggshell-like) tunics which can split at the base. Basal rings (see below) are a feature of this species. Wild plants often have several years accumulation of tunics wrapped around them.
Crocus biflorus tunic basal rings
Crocus cancellatus tunics (wild): Netted tunics, which have accumulated around the corm over many years giving protection from extreme drought.
Crocus pallasii haussknechtii (wild): Fibrous tunics with extended neck. Many years accumulation of tunics around the bulb Indicate that this species comes from a semi-desert habitat.