NO. 1 TAYLOR: PACIFIC MARINE ALGAE 211 



Prionitis abbrevlata Setchell & Gardner, prox. 



Plants to 10 cm tall, dull purplish, subcartilaginous ; the axis com- 

 pressed below, flat above, branching irregularly, to 2-3-chotomous, wide 

 angled, the divisions 3-4 mm broad below, 6-7 mm above, strap shaped, 

 abundantly beset on the margins with simple or forked ligulate prolifera- 

 tions; structure densely filamentous in the broad medulla, the filaments 

 closely conjoined by their firm walls, outwardly larger in diameter and 

 pseudoparenchymatous, giving rise to the cortex of closely united anti- 

 clinal cell series, the cortical cells square in section. 



Setchell & Gardner 1942, p. 785, pi. 25, fig. 39, pi. 50, fig.b. 



These specimens differ from the photograph of the type given by the 

 authors in being somewhat larger, with smaller lateral proliferations or 

 leaflets. 



Ecuador: Archipielago de Colon, infrequent on rocks in the littoral 

 region near Black Beach Anchorage, I. Santa Maria, no. 34-247, 17 Jan. 

 1934. 



Prionitis Hancockii n. sp.^^s 

 Plate 67 



Plants to 18 cm tall, bushy, dull purplish red, near the base com- 

 pressed, above quite flat, erect spreading, branching 7-10 times irregularly 

 pinnately to subdichotomously, the angles 30°-60° and usually rounded, 

 the segments to 3-4 mm wide in the central part of the plant, 2-3 mm 

 wide in the upper branches, those below somewhat longer than those 

 above, in the central part marginally beset with numerous spatulate to 

 kidney-shaped proliferations or fertile tetrasporiferous branchlets 2-3 mm 

 long. 



These plants resemble no. 34-247 from the same station somewhat, 

 but are much more erect and slender, more abundantly branched and 

 with proliferous branchlets of a different form. They differ from P. 

 aiistralis J. Ag. in being smaller, lighter plants with more proliferations 

 but less pronounced ultimate branch segments. In this difficult genus one 

 cannot be very confident of the span of variation of any species without 

 field experience much beyond what could be acquired during a quick 

 exploratory trip. 



Ecuador: Archipielago de Colon, occasional on rocks near Black 

 Beach Anchorage, I. Santa Maria, no. 34-224 (TYPE), 17 Jan. 1934. 



125 Prionitis Hancockii n. sp. — Plantae ad 18 cm altitudine, fruticosae, erecte 

 patentes, 7-10-irregiilariter alterne aut subdichotome ramosae, segmentis supra 

 planis, ad 3-4 mm lat., longioribus in parte inferiore plantae quam in parte supe- 

 riore; ramulis proliferis marginalibus, spatulatis ad reniformes, 2-3 mm long., 

 saepe tetrasporiferis. Planta typica in loco dicto I. Santa Maria, Ecuador, legit W. 

 R. Taylor no. 34-224, 17 Jan. 1934. 



