Hymenophyllum. | XCIV. FILICES. 569 
ovate, about a line long, deeply divided into 2 flattish lobes, often minutely 
toothed round the edge. 
In moist, rocky, or shady situations, dispersed over most of the warmer 
mountain districts of the old world, especially in the southern hemisphere, 
more rare in America, extending from the Canary Islands and western 
Europe to Belgium and Norway, but not recorded from eastern Europe or 
any part of the Russian dominions, nor from North America. Generally 
distributed over the greater part of Britain, but more frequent in Scotland, 
northern and western England, and Ireland, than in eastern England. Fr. 
summer and autumn. <A variety with the valves of the involucre entire, 
not toothed, is usually distinguished as a species, under the name of JZ. 
umlaterale, Willd. (fig. 1310), or H. Wilsoni, Hook., but the other 
characters, said to accompany this one, such as the narrow involucres, the 
different direction of the lobes of the fronds, etc., do not appear to me to 
be so constant as they are supposed to be; and the teeth of the valves, 
when present, are very variable. The entire-valved form is the most common 
in Scotland and Ireland, but the two are often intermixed. 
