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quam latnm, sinu anguste lineari, semicellulis truncato-pyra- 
midatis, granulis concentrice ordinatis, a vertice subtruncato- 
ellipticis elevatione centrali lata, a latere obtuso-ovatis. 
Long 88 IX ; lat. 60 /x ; lat. isthmi 23 ix. 
Frond granulate, about one-half longer than broad, sinus 
deep and linear, semicells truncately pyramidal, end view 
elliptic with a broad elevation at each side, side view obtusely 
ovate, granules arranged somewhat concentrically. C. 
This approaches G. ochthodes Nord. in form ; it also has some 
resemblance to large forms of C. hotrytis Meneg., but the end and 
side views at once distinguish it from these species. It was very 
sparingly seen. 
G. Broomei Thw. S., C., B. Do. 
G. ochthodes Nord. C., S., P. B., Do., Bettws-y-coed. 
*G. confusum Cooke regularius Nord. C. 
G. amoenum Breb. C. 
G. Boechii Wille. C. 
G. sphalerostichum Nord. & Wittr. B., C., P. 
G. suhcrenatum Hantzsch. 8. 
G. coelatum Ealfs. B., S., Do., P., Twll Du. 
var. HEXAGONUM nov. var. Fig. 30. 
Var. cellulis hexagonis, apicibus truncatis tetracrenatis, 
granulis centralibus in seriebus linearibus ordinatis. 
Long. 43 /X ; lat. 36 /x; lat. isth. 10 
This differs from the semiorbicular type in having a distinctly 
hexagonal form, bearing four of the crenatures of each semicell at the 
truncate ends ; the central granules are also arranged in linear series 
not concentric. C. 
G. ornatuni Ealfs. B., A. 
G. cristatum Ealfs. C. 
G. quinarium Lund. C. 
G. isthmochondrum Nord. C. 
G. quadrifarium Lund. C. 
forma hexasticha (Lund.) Nord. C. 
G. hexalobum Nord. B. 
G. cyclicum Lund. S. 
G. s^eciosum Lund. C., Bettws-y-coed. 
G. suhspeciosum Nord. C. 
G. orUculatum Ealfs. P., Bettws-y-coed. Fig. 18. 
*G. isthmium nob. Fig. 19. 
Lat. 25-26 fx. 
This is the same as G. excavatum Nord. var. duplo-major Lund., 
as described and figured by Wolle (Desm. U.S.A., p. 77, pi. liii. 
figs. 14 and 15). As I do not believe this species to be a variety of 
