No. 2] NEW SPECIES OR FORMS OF MELOBESIEAE. 7 



thallus except a narrow peripherical portion. They are frequently 
subprominent, flattened subhemispheric, 0.7—1 mm. in diameter 
seen from above, and the roof is intersected with about 80 muci- 
ferous canals. The sporangia are four-parted and very large, 
250—350 p» long and and 100—150 w broad. The conceptacles 
of cystocarps also are crowded, often so densely that they become 
angular, subhemispheric-conical, 0.6—0.9 mm. in diameter seen from 
above. In thick and lumpy specimens they are exceptionally even 
developed in the lower part of the frond. 
The roof of the conceptacles of sporangia appears frequently 
to get dissolved at maturity and the scars filled by new formed 
tissue especially in thin crusts. Sometimes however the concep- 
tacles become in part overgrown even before the sporangia are 
mature, and at length fully overgrown, but the sporangia are then 
as a rule escaped. The conceptacles of cystocarps seem to be 
Overgrown in the same proportion as the former, sometimes also 
these in part before the spores are mature, become however fre- 
quently emptied before fully overgrown. Such emptied and nearly 
Overgrown conceptacles sometimes look, as if they had not or 
scarcely been raised above the surface of the frond, as the orifices 
now and then do not become covered before several layers of 
tissue are formed over the conceptacles, and therefore on a section 
appearing rather elongated. This however occasionally takes place 
also in other species. 
The plant stands between L. Patena and L. lichenoides, in 
some respects forming an almost intermediate link between both, 
sometimes much resembling the former in habit, sometimes however 
rather differing. 
Occurrence. Pacific coast of North America: Monterey, Cali- 
fornia, W. A. Setchell; and Port Renfrew (Port San Juan), 
Vancouver Island, B. C. on Cheilosporum frondescens between tide 
marks, collected by Mr. K. Yendo of Tokyo. 
Goniolithon mamillare (Harv.) Fosl. 
Melobesia mamillaris Harv. Ner. Austr. p. 111. 
f, litoralis Fosl. mscr. 
