KEY TO TEIBES AND GENERA OF FLORIDE^. 45 



KEY to TRIBES and GENERA of the FLORIDEJE. 

 (Red or Purple Marine Alg^e.) 



By Richard A. Bastow. 



(Communicated by J. H. Maiden, f.l.s.) 



[With Plates I., II.] 



[Read before the Royal Society of N. S. Wales, June 7, 1899, ,] 



It is essential in the study of the Florideae in the first place to 

 acquire some knowledge of the organs of fructification charac- 

 teristic of each tribe ; it is then much easier to become familiarised 

 with the habits of the various genera constituting each tribe. 

 Knowing by experience that in botanical studies a few lines 

 however roughly drawn may, in many cases, convey more informa- 

 tion than a large amount of letterpress, I have made a chart of 

 the tribes of Florideae on Plate i, showing the conceptacular fruit 

 common to each tribe, the fruit being shown in section or in out- 

 line, and where necessary the spores also are shown. 



Immediately under each drawing of the tribes a tribal descrip- 

 tion will be found, and each tribal description embraces, in 

 brackets, the genera of which each respective tribe is composed. 

 It will also be observed that there is a short description to each 

 genus, with a reference to the authority I have relied on. Also, 

 each genus is numbered plainly, and the number corresponds to 

 the numbers of genera in Dr. Sonder's Catalogue of Australian 

 Algae contained in the eleventh volume of Baron von Mueller's 

 Fragmenta Phytographiae Australia?. The generic number also 

 corresponds with the number of the generic illustrations on Plate 2. 



I have spared no trouble to obtain the most reliable authority 

 for each item of information on the plates. Free use has been 

 made of the beautiful illustrations contained in the various works 

 of Dr. W. H. Harvey, also of those in Flor. Tas., Flor. Nov. Zeal., 



