BOTANICAL SOCIETY OF EDINBURGH. 569 



or less closely ensheathed by small celled rhizoids, which 

 grow towards the interior of the axis from the inner limit 

 of the wall of the shoot. Alternately beset with paired 

 cell filaments extending horizontally, and copiously branched 

 towards the exterior, their upper ramifications, which cohere 

 to form the wall of the shoot composed of anticlinal rows 

 of cells, and on the exterior very small celled, while some- 

 what more loosely arranged internally. 



Apical cell very small, dividing alternately in an oblique 

 manner. Mucilage very easily changed into mucus. 



Sporangia arranged in pairs scattered in the outer cortex. 



Procarps, in the form of small compact tufts of filaments, 

 distributed over the inner margin of the shoot wall, each 

 composed of a hook-like auxiliary cell-filament with inter- 

 calary auxiliary cells, many pluricellular carpogone cell- 

 filaments adhering together laterally as well as many sterile 

 short filamentous twigs. 



Cystocarps distributed over the upper portion of the 

 shoot of fertile individuals projecting externally as small 

 elevations, or quite sunk in the tissues. Fruit nucleus 

 imbedded in the inner cortex, or projecting to a greater or 

 less distance into the inner cavity of the shoot. 



Gonimoblast hemispherically reniform, firmly coherent 

 without separate successively ripening gonimolobes, attached 

 by means of an irregularly branched basal fusion-cell, 

 becoming entirely converted into spores, with the exception 

 of a few sterile basal cells. 



Paraspore fruits appear on the sporangium - bearing 

 specimens of certain species. These are rounded or 

 indistinctly lobed masses of spores which, embedded in the 

 inner part of the wall of the shoot, cause more or less 

 marked outward projections of the outer cortex. These 

 spore masses remain penetrated by separate filaments and 

 strands of sterile tissue. Paraspore fruits of this kind may 

 easily be mistaken for cystocarps. 



Xumber of species, perhaps five (in part very variable), 

 from the northern part of the Pacific Ocean. 



As has been already done in my review of the hitherto 

 known genera of Florideic,^ Gloiopdtis must be placed, on 

 account of its form and mode of development of the cysto- 

 1 Flora, 1882. 



TRANS. BOT. SOC. EDIX. VOL. XX. 2 O 



