100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 17 



cell layer and by short descending rhizoidal filaments; erect filaments 

 separating easily under pressure, terete in tetrasporangial examples, 

 slightly clavate in carposporangial examples, irregularly and rather fre- 

 quently branched, the lowermost cell more or less isodiametric and larger 

 (9-15 ix), those above abruptly narrowed (4-6 fj, wide) and mostly 

 elongated; tetrasporangia regularly cruciate, the division to form the 

 upper 2 spores at right angles to that forming the lower, slender, fusi- 

 form, 70-80 jx long, 16-20 ju, wide, attached basally to a 2-6-celled fila- 

 ment among the sterile filaments, scattered; carpospores about 18-20 [x 

 long, ovate, borne in short, branched chains usually of 4 spores. 



Type: Holotype is Dawson 4283c, June 20, 1947, in vial 2290 

 and on slides 1618-1620 in HAHF. 



Type locality: Growing on shells at a depth of 13-15 meters at 

 32° 24.5' N. Lat., 117° 13.8' W. long, of! South Island, Islas Los 

 Coronados, Baja California, Mexico. 



Additional material: D. 4280, growing on Bossea dredged at 

 the type locality with the type. 



This species is similar to Cruoriopsis rosenvingii B<^rgesen in the 

 regular divisions of the sporangia, but differs in the much greater size 

 of the sporangia and in the shape of the erect filaments. 



Although the family position of the genus Cruoriopsis is uncertain, 

 it is felt that for purposes of this account it will most readily be re- 

 cognized in the Squamariaceae. 



Ethelia mexicana sp. nov. 

 Plate 11, figs. 7-8 



Thallo stricte affixo, 2-3 cm. vel plus lato, superficiebus irregular- 

 ibus, exigue calcificato, 400-1000 fi crasso, primo ope rhizoidum pluri- 

 cellularium affixo, mox ope molis textus deorsum crescentis et rimas 

 complentis; cellulis summis perithalli 4-6 ju, latis; nematheciis tetra- 

 sporangialibus mersis 120-130 fx altis, summa parte plus minusve super- 

 ficiei vegetativae aequali ; paraphysibus baud ramificatis, valde tenuibus, 

 exigue clavatis, 7-8 cellularum; tetrasporangiis longeovatis, 45-50 fx 

 longis, 18-20 ju, latis. 



Thallus crustose, 2-3 cm. or more in extent, firmly and closely 

 attached to the substrate and assuming all of the irregularities of its 

 surface, dark dull purplish-red in color, lightly calcified in inferior parts, 

 without conspicuous surface markings, not fissured when dr^'^, varying 

 in thickness depending upon irregularities of the substrate from 400- 



