OF ARTS AND SCIENCES. ' 217 



The remaining two species differ from all those which we have 

 mentioned in the finely tuberculate outer surface of their spore-masses. 

 No. 10 of Vize's "Micro Fungi Exotici" is an East Indian Ravenelia, 

 which, unlike all others, occurs not in clusters, but superficially scat- 

 tered over the leaf of an unknown host. It is named R. stictica, 

 Berk, and Br., and has a small head composed of half a dozen spore- 

 cells, with cysts and a compound stem. Its stem and cyst-cells are 

 arranged after the type of R. glandulceformis, but the spore-cells are 

 all unilocular (Fig. 21), and in this respect it approaches R. Indica. 

 However, since the spores appear to be subtended each by a cyst-cell, 

 and these in turn supported by stalk-cells, its affinities as a whole are 

 closer to R. glandulaformis than to R. Indica. The ornamentation 

 of its spores is very characteristic ; their whole outer surface is covered 

 with small, wart-like protuberances, while on the periphery of the 

 spore-mass these are so much elongated and enlarged that they 

 appear as so many spines. 



The second species agrees with the one just described in having the 

 whole outer surface of its spore-mass covered with small prominences, 

 but the heads are much larger and heavier than those of the former, 

 and consist of about thirty closely compacted small spores, the lateral 

 ones devoid of spines. This species was from Winter's Herbarium, 

 and was labelled ^'■Ravenelia Tephrosice, Kalchbr, On TepJirosia 

 (macropoda ?), Natal." The stalk is compound, and the cyst-cells, as 

 far as can be seen externally, are arranged in accordance with the 

 type of R. glandulceformis. The general habit of the fungus when 

 seen on its host ig strikingly like that of the last-named species. 



With this we conclude the list of species which have come under 

 our observalion, and as a result of these notes we may present in clos- 

 ing two generalizations : first, that the species examined seem to fall 

 under two distinct types of structure, one represented by R. Indica, 

 and including that species and probably R. acideifera, and the other 

 represented by R. glandidceformis, and including R. sessilis, H. gla- 

 bra^ R. Tephrosice, and probably R. stictica (Vize) ; second, that all 

 the species thus far examined have had well-developed stalks and 

 cyst-cells, and that consequently the so-called sessile species are in all 

 probability species in which the s^iecimens studied were so ripe as to 

 have ruptured their cyst-cells, and thus appeared stemless. Such 

 species as are related to R. glandidceformis will probably be found to 

 have much the same development as that form ; those of the type of 

 R. Indica require yet to be investigated, and we feel that it is in this 

 direction that a profitable field for research awaits the future student 

 of Ravenelia. 



