OF AETS AND SCIENCES. 213 



change in the nomenclature, that the term capitule is substituted for 

 pseudospore as employed by the Rev. Mr. Berkeley, and that this 

 latter term is now used to designate the single spores of the spore- 

 mass. R. glandulceformis, Berk, and Curt., and R. Indica, Berk., are 

 redescribed. The remaining species are all sessile, and the author 

 remarks, that, although they are " described as sessile, this must rather 

 be interpreted to intimate that the stem is reduced to such a minimum 

 as to be little more than a mere point of attachment." R. glabra, K. 

 and Cke., is added. This last species, from the material at hand, 

 seemed to have no stem- or cyst-cells, but Mr. Cooke is of the opinion 

 that in fresh material the cyst-cells would probably be found. R. aculei- 

 fera, Berk., is spoken of as having hyaline processes at the base of its 

 spore-mass, and shows no trace of either stem- or cyst-cells. R. Hob- 

 soni, Cke. {= R. stictica. Berk, and Br., Grevillea, V. p. 15), has 

 hyaline spines on its marginal spore-cells. R. stictica, Berk, and Br., 

 is described as possessing small cysts and a spore-mass, with a warty 

 outer surface. R. macrocystis has not been seen by the author. 



The material available for anatomical work seems to have been 

 largely R. aculeifera, Berk. By gentle pressure a spore-mass of this 

 species can be broken up into its individual spore-cells, which are 

 club-shaped, with their thick outer ends deep brown, and their nar- 

 rower inner ends colorless. In all cases the single spores extend 

 from the under to the upper surface of the spore-mass, and there is 

 nothing in the central region corresponding to what we have de- 

 scribed in R. glandulceformis as an internal and an external set of 

 spore-cells ; in other words, all the hyphae of R. acideifera, if thei'6 

 be such, bear unilocular spores. Other species were examined, and 

 the author became convinced that the structure of the spore-mass was 

 essentially the same in all, — a cluster of spores temporarily held to- 

 gether, but destined to separate at maturity. " The barren cysts 

 which surround the capitules in some species yet require to be inves- 

 tigated. The stalk, in both R. Indica and R. glandulceformis, under 

 pressure separates into parallel tubes. Probably, but this is only 

 speculation, the number of threads may equal that of the pseudospores 

 in the capitule." 



The type of structure which we have suggested for R. glandulce- 

 formis is partially anticipated in Mr. Cooke's closing remark. To 

 what extent this type explains the structure of the remaining species 

 of Ravenelia is a question only to be answered after a careful com- 

 parative study. Through the kindness of Dr. Farlow, the writer was 

 given access to the specimens of Ravenelia contained in the Curtis 



