14 M. FOSLIE. [190O 



lotvii they are on the whole a little larger than in the former, and 

 more often vertically elongated. 



The conceptacles of sporangia are subprominent, subhemi- 

 spheric, with a central pore, about 220 fi in diameter seen from 

 above, and the roof at length somewhat decorticated. The spo- 

 rangia are four-parted 90 — 100 jx long and 50 — 60 fi broad. 



The spedes is known from California, Monterey, Far lo w in 

 herb. Bornet, and herb. Far lo w no. I; Pacific Grove, Dr. De 

 Alton Saunders, no. 436 a. Besides a young specimen most 

 probably belonging to the same species has been collected on 

 Baranoff Island, Dr. De Alton Saunders, no. 438. 



Goniolithon Fosi. 



Subgen. Cladolithon Fosl. 



Thallus branchy. Conceptacles of sporangia almost superfi- 

 cial with rather short tip, not growing down into the frond. 

 Tppe: G. frutescens Fosl. 



G. ? strictum Fosl. mscr. 



Thallus forming large masses repeatedly subdichotomously 

 branched, branches in the lower part of the frond somewhat sprea- 

 ding and curved, terete or occasionally slightly compressed, up 2 

 mm. thlck, rather anastomosing, here and there with side-branches 

 isssuing at right angles, upwards densely crowded, erect, fastigiate 

 and straight or sometimes a little curved, terete and feebly tapering r 

 1 — 1,5 mm. thick, with rounded ends. 



The solitary and somewhat fragmentary specimen that I have 

 seen appears to have been attached, and is about 14 cm. 10 cm. 

 broad and 6 cm. thick. It is of a loose consistency and very 

 brittle. 



A mediam longitudinal section of a branch shows a pith layer 

 composed of rather regular radiating cell-rows the cells of which 

 are frequently 2 — 3 times longer than broad, 35 — 55 p. long and 

 15 — 25 ;j. broad, with thin walls. The perithallic layer is compo- 

 sed of less regular cells wich are partly square or somewhat roun- 



