is soft, flaccid, aud delicately membranaceous, and the frond closely adheres 

 to paper in drying. 



This well-marked and handsome species was discovered in 

 Sydney harbour by Mr. Charles Moore, from whom I received 

 the only Australian specimens I have seen of it. But much 

 more copious specimens have been sent to me by an American 

 explorer, Dr. Morrow, who collected them at Hakodadi, Japan. 

 On comparing individuals from both habitats, the chief differ- 

 ences observable are, that the colour in the Japan plants is 

 duller and more purple, and the fronds and leaflets more acu- 

 minate ; but in substance, serrated margin, and cellular struc- 

 ture, they so well agree with the Australian, that I do not think 

 it advisable to separate them specifically : particularly as the 

 allied species, D. Hypoglossum and D. crassinervia, vary in a 

 similar manner. As yet very few specimens have been found at 

 Port Jackson, and probably, had we a larger series for compari- 

 son, the identity with the Japan plant would be more absolute. 



Prom all closely allied species this is known by its sharply ser- 

 rate margin : from the narrower forms of D. frondosa by the 

 very broad and strong midrib. 



Fig. 1. Delesseria serrulata, — the natural size. 2. Leaflets with concepta- 

 cles. 3. Apex of a leaflet, to show the cellular structure. 4. One of the 

 serratures of the same. 5. A vertical section of a conceptacle: — the latter 

 figures variously magnified. 



