450 BOTANICAL GAZETTE [JUNE 
having entirely smooth cells, the other having at least a portion of 
the surface roughened. I have subdivided the latter class upon the 
nature of the roughness, and have used the terms rugose, verrucose, 
verruculose, and spinulose to designate the four subdivisions. 
Very little comment is needed for the class having smooth cells. 
It is the exception to the general rule, only two species being known 
which belong here. One is R. hyalina (fig. 11) and the other is 
G. Botryapites (fig. 12). These are unusual forms in other ways, 
as seen by the fact that both have been mentioned previously as being 
the only forms not conforming to the general type with respect to 
thickness of walls. Thus it will be seen that nearly all of the species 
have peridial cells which are sculptured in some way. No single 
word or even a single phrase will suffice for a description of the 
markings. It is necessary in most instances to resort to rather long 
and complicated sentences to convey details enough to be fairly 
accurate. The terms employed to designate the various classes are 
intended only to be descriptive in a general way. The rugosely 
sculptured cells are furnished chiefly with ridges or with elongated 
ridgelike papillae in such a way that the effect is that of a surface 
covered with rugae or folds; the verrucosely marked cells are studded 
with warty or tubercle-like elevations; the verruculose surfaces are 
covered with low wartlike protuberances; the spinulose cells have 
diminutive spines or spicules. 
The markings always cover the entire inner wall (figs. 16, gb, 17), 
extending to the side walls, in some forms reaching clear across 
(figs. 1a, 3, 4, 8, 10, 13, 14, 16), in others only a part of the distance 
(figs. 2, 6, 7, 9a, 15), leaving the remaining outer part of the side 
wall and the entire outer wall, with one exception, smooth. Only 
one species has been found which is an exception to this general type 
it differs in having the outer wall also sculptured. This is an unde- 
scribed and unattached species (not included in the table), and 1s 
further notable in being the only one having cells with spinulose 
warts (fig. 17). 
Of the sixteen species enumerated in the table, one-half have 
rugosely sculptured cells, nos. 1, 2, 3, 4, 5, 8, 10, 14.4 In all these 
the ridges or ridgelike markings begin on the inner wall (as in fig. 14), 
4 These numbers also correspond to the figure numbers on the plates. 
