A minute but neat-growing species, as yet only found by Mr. 
Gunn in the locality above given. ‘There it is probably not un- 
common, Mr. Gunn having secured a good handful of speci- 
mens, many of which were covered with fruit. Its characters 
are well marked, and it is not likely to be mistaken for any 
Australian Alga as yet known. 
Fig. 1. GyMNoGoNGRUS FasTIGIATUS,—the natural size. 2. Portion of the 
fertile frond. 3. Cross-section through a cystocarp. 4. Spores from the 
same. 5. Portion of a barren frond. 6. Cross-section of the same. 7. 
Portion of the same section, enlarged :—variously magnified. 
