340 University of California Publications in Botany [Vol. 7 



Myrionema corunnae f. angulatum forma nov. 



I'late 33, figures 6, 7 



Prondibn.s pulviiinlos microscopicos linea extoriore irregularibus, 

 ill hopites inter algas alteras parvas, f omiantibus ; filamontis repen- 

 tibus sub conditiones augmentation is liberae radiantibus; filamcntis 

 erectis eramosis. dense stipatis, 130-140|U. longis; pilis veris dcuntilius; 

 eellulis filamentorum repentium 4-4. 5/x diam., plerum(|ue quadratis; 

 cellulis filamentorum ereetorum cylindricis, 4-4.5/x, diam., 1.5-3-plo 

 longioribus; zoosporangiis et "ascocystis" ignotis; gametangiis cylin- 

 drieis, apiee leviter attenuatis, in pedicellis cellulis 6-10 compositis 

 suffultis, 35-45/A (usque ad OO/x) lougis, 4-6. 5/i. latis, septorum multis 

 obliquis. 



Growing on the cysts of Egregia Menziesii. Cast ashore near the 

 "Cliff House," San Francisco, California. Type, Gardner, no. 3471& 

 (Herb. I'niv. Calif., no. 207015), August. 



This form is to be distinguished from the species as described by 

 Sauvageau (1897, pp. 77-82, repr.) by the absence of hairs, the presence 

 of sterile erect filaments, the gametangia mostly on longer pedicels and 

 by the very small .size of the loculi, often produced by perpendicular 

 and slanting walls. In part, the gametangia seem pluriseriate, caused 

 by the division of some of the original cells into small, angular loculi. 



Myrionema corunnae f. sterile forma uov. 

 Plate 33, figures 13-] 5 



Frondibus pulvinulos orbiculares 1.5-3 mm. diam. formantibus; 

 filamentis erectis rectis. simplicibus. cylindricis, obtusis, 55-65/a longis; 

 pilis veris et "ascocystiis" deuntibus; gametangiis cylindricis. obtusis, 

 in pedicellis cellulis 3-5 compositis suffultis. raro sessilibus, 55-65^ 

 longis, 4.5-5. 5;a latis; gametangiis et filamentis erectis sterilibus e 

 centre ad margines frondis longitudine regulariter gradatimque 

 diminuendis. 



Growing on the pneumatocysts of Xereocystis Luetl-eana. Cast 

 ashore. Carmel Bay, Monterey County, California. Type, Gardner, 

 no. 4557 (Herb. Univ. Calif., no. 207027), December. 



This form is to be distinguished from the species as described by 

 Sauvageau (1897. pp. 77-82, repr.) by the presence of numerous sterile 

 erect filaments interspersed among the gametangia, about one-fourth 

 to one-fifth as many as the gametangia, in the absence of hairs, and in 

 the very gradual diminution in the length of the sterile filaments and 

 the gametangia from the center to the circumference of the fronds. 

 The sterile erect filaments are of the same length as the gametangia. 



