UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 7, No. 9, pp. 279-324, plates 21-31 July 8, 1920 



PHYCOLOGICAL CONTRIBUTIONS library 



BY 



WILLIAM ALBERT SETCHELL and NATHANIEL LYON GAEDNER 



Hormiscia doliifera sp. nov. 



Filamentis 3-4 cm. longis, dum juvenis prope cylindicis, ad basim 

 tantummodo attenuatis, rhizoideis extramatricalibiis e segmentis panels 

 infernis oriundis adjunctis, atroviridibus ; segmentis fertilibus 80-130ju 

 usque ad 184/x diam., 0.75-1.25-plo diam., longioribus, doliiformibus, 

 parietibus tenuibus, 5-7 /x erassis, hyalinis, honiogeneis ; ehromatophoris 

 tenuibus fenestratis taeniaeformibus, parietalibus, pyrenoideis parvis 

 numerosis. 



Filaments 3-4 cm. long, nearly cylindrical throughout when young, 

 tapering only at the base, attached by extramatrical rhizoids from a 

 few of the lower segments ; color dark green ; fertile segments 80-1 30fi, 

 up to 184|Li diam., 0.75-1.25 times as long, doliiform, with thin, 5-7ju, 

 thick, hyaline, homogeneous walls ; chromatophore a thin fenestrate 

 parietal band, with numerous small pyrenoids. 



Growing on rocks in the upper littoral belt. South side of the 

 Golden Gate, San Francisco, California. July, 1918. Type no. 4462, 

 Gardner. 



Hormiscia doliifera resembles most closely Urospora Hartzii Eosen- 

 vinge (1893, p. 922) and V. in cmssaia Kjellman (1897, p. 7). From 

 each of these species it differs in having filaments of larger diameter, 

 in having more uniformly swollen, sometimes almost spherical, fertile 

 segments, and in having the segments more nearly uniform in length, 

 averaging a little less than quadrate. From Z7. incrassata it differs 

 also in its strictly extramatrical rhizoids. It approaches also the 

 little known V. crassa Rosenv., but its segments seem never so short 

 as represented for that species. It is much too slender for Hormiscia 

 collahens (i.e., up to 450/j,), as indicated by Batters (1894, p. 114). 

 CNj The filaments are decidedly larger than any dimensions given for 



