466 OPHIOGLOSSUM VrLGATUM. 



America, Mexico, New Zealand, New Holland, Cape of Good 

 Hope, in the Caucasus, East Indies, Siberia, and in Kamtschatka. 



Fronds three to twelve inches in length, thin and fleshy. 

 Sterile fi'ond smooth, sessile, entire, ovate-elongate, and yellowish 

 green in colour. Fertile frond — a single spike terminating an 

 elongate footstalk. Spike linear. 



^ eins anastomosing without a midvein. 



MiCROSTiCHUM, Moore. — Found at Swanbister, in the Island 

 of Orkney, by Mr. J. T. Syme. Much smaller, narrower, and 

 the frond becoming mature in September, at a time when the 

 normal form has died away. 



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