1920] Setchell-Gardner : Chlorophyceae 193 



referable to H. penicilliformis. Some of the specimens included here 

 by lis have been referred to Hornmcia incrassata, (Kjellm.) Collins, 

 but that is a somewhat larger species with a coarsely reticulate chro- 

 matophore. Some of the specimens referred by us previously (1903) 

 to Urospora penicilliformis seem to us now to be placed more satis- 

 factorily under Hormiscia grmidis (Kylin) S. and G. 



2. Hormiscia doliifera S. and G. 



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 80-130ja, 

 up to 184/x 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. San Francisco, Cali- 

 fornia. 



Setchell and Gardner, Phyc. Cont. I. 1920, p. 279. 



Hornmcia doliifera resembles most closely Urospora Hartzii Rosen- 

 vinge (1893, p. 922) and U. incrassata 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 U. incrassata it differs 

 also in its strictly extramatrical rhizoids. It approaches also the little 

 known U. crassa Rosenv., but its segments seem never so short as rep- 

 resented for that species. It is much too slender for Hormiscia col- 

 labens (i.e., up to 450/*) as indicated by Batters (1894, p. 114). The 

 filaments are decidedly larger than any dimensions given for H. peni- 

 cilliformis (Roth) Fries and the chromatophore is thinner, usually 

 more coarsely reticulate, and with many more and much smaller 

 pyrenoids. 



3. Hormiscia tetraciliata Frye and Zeller 



Filaments flaccid, slightly clavate, 25/* at the base, up to 220/x at 

 the apex, 5-8 cm. long, attached by numerous intramatrical rhizoids, 

 1-2 from each of the lower 8-15 segments, passing out of the lower 

 disintegrating sheath, or segment wall; segments 0.5-2 times as long 

 as the diameter, cylindrical below, becoming decidedly barrel-shaped 



