smooth and naked ; wlien mature, mostly sprinkled with minute tooth-like 

 processes, which sometimes change into small prolilerous leaflets, and some- 

 times into branching ranienta. The cystocarps (cocddia) are very couvex, 

 with a depressed orifice, and are scattered over the disc of the whole frond. 

 Tetranporcs are, in like manner, scattered over the whole surface of plants 

 that bear them. Colour a full, dark, blood-red, becoming darker and brown- 

 ish in drying. Substahce cartiiagineo-membranous, thick and tough. In 

 drying the frond adheres, but not strongly, to paper. 



This is very similar in size, colour, ramification, and general 

 aspect to Call, ciliata of the northern hemisphere, but is at once 

 distinguishable from that species by the position of the cjjsfo- 

 carjjs, which in C. ciliata are invariably borne on the marginal 

 cilia, while in C. conspersa they are dispersed over the whole 

 surface. Both species are remarkably variable in form, espe- 

 cially in the comparative breadth and division of the segments. 

 So far as we know, our present plant, when young, is pretty 

 regularly obovate, often with a perfectly entire smooth edge. 

 A little older, it becomes erose or denticulate ; then the inden- 

 tations are prolonged into marginal processes, and finally into 

 leafy lobes. During this evolution the obovate form is gene- 

 rally lost, changing into oblong and then to lanceolate ; and 

 the margin in the oldest fronds is very unequal and fimbriate. 



Fig. 1. Calliblephauis conspersa, young and old plants, — tlte nntnral size. 

 2. Section through the frond, and a coccidluvi. 3. Section of frond, show- 

 ing tetraspores among the surface cellules : — magnified. 



