1918] Gardner: New Pacific Coast Marine AIga( III 463 



basal portion is (pi. 39, fig. 11a). In other cases the (ii-st division is 

 through the center of the cell. Other gonidia develop for a time after 

 coming to rest, then divide vegetatively several times, generating 

 small colonies before advancing to the gonidial stage (pi. 31), fig. 11&), 

 Tliis species is named in honor of Dr. Helen M. Gilkey, the artist 

 who drew the accompanying illustrations and who discovered it while 

 drawing the host ])lant ii])on which it grew. 



Xenococcus pyriformis Setchell et Gardner sp. nov. 



Plate 39, fig. 12 



Coloniis parvis, nunc solitariis nunc confluentibus : C(41ulis juvenis 

 paululum angulatis, maturitate pyriformihus usque ad su])sphaeroi- 

 deis, 10-15;Li diam., 12-20a longis: eytioplasmate laete coeruleo-viridi ; 

 parietibus conspicuis, densis, hyalinis ; gonidangiis cellulis vegetativis 

 forma magnitudineque similibus; gonidiis 2.8-3.5)li diam., divisionibus 

 iteratis formatis. 



Colonies small, single or occasionally confluent, young cells some- 

 what angular, pyriform to subspherical at maturity, 10-15/x diam., 

 12-20/t long; protoplast bright blue-green, cell wall conspicuous, 

 dense, hyaline, gonidangia the same shape and size as the cells; 

 gonidia 2.8-3.5/m diam., formed by successive divisions of the proto- 

 plast. 



Growing on Rhodochorloit Rothii on rock ledge along high-tide 

 level and above. Cape Arago, at the entrance to Coos Bay, Oregon. 

 Type no. 2756, Gardner. 



This species having cell divisions in only two planes perpendicular 

 to the substratum, thus forming colonies only one cell deep, is allied 



with X( xovocvHs ratlicr tlian with PJeurocapsa, and wliilc its ]>yi'i- 

 form cells suggest species of Dermocarpa. it differs from incmliers of 

 that genus in having vegetative cell division. In size and shape of 

 cells it differs from tlir other members of Xenococcus so far as yet 

 described. 



Pleurocapsa entophysaloides Setchell et Gardner sp. nov. 



Plate 41, %. .'^0 



Strato umbrino, i)uIverulento, plus minusve mueilagineo, 14 mm. 

 crasso; cellulis sphaericis 8-10/* diam., in coloniis maxime angulatis. 

 colonias sphaericas aut varie lobatas frequenter eiitophysaloideas, 

 40-60/i, us(|ue ad 20()/i diam., divisionibus iteratis sine ru])tione tegu- 

 menti counnunis foi'umntibus ; tegiuuentis leviter nuicosis. luteo-fu.scis, 

 2(1 crassis ; cytioplasmatt^ homogeneo, dilute coeruleo-viridi ; gonidiis 

 in cellulis vegetativis imniutatis formatis aut in coloniis parvis aut 

 in magnis, 3-3. 5/i diam. 



