Monday, 4 July 2016

Encalypta vs Tortula

I see your excurrent green Tortula nerve, George, and raise one of my own.  This is from an Encalypta 'vulgaris' on the limestone of Creigiau Eglwyseg in Denbighshire from a couple of weeks ago.  However, the Floras say that E. vulgaris has the nerve ending in the leaf tip and Tom Blockeel recently published the occurrence of the excurrent-nerved E. pilifera in Britain (including a collection of mine from the NE Wales limestone).  The costa of E. pilifera is usually much longer than this, but the lingulate leaf shape also points to that species.  I am puzzled!