NO. 1 TAYLOR : PACIFIC MARINE ALGAE 45 



Pilinia maritlma (Kjellman) Rosenvinge, f. pacifica F. Thivy n.f.*^ 



Thallus extending as discs 0.5-1.0 mm diam., with the basal layer of 

 more or less isodiametric cells 2.5-10.5 [x diam., at first distinct, later less 

 conspicuous; erect filaments numerous, 0.2-0.4 mm long, usually un- 

 branched with the lower cells cubical, the upper elongate cylindrical, 

 with a basal diameter of 5.1-7.7 ju, ending in articulate hairs 1-3 ju, diam.; 

 sporangia on short erect few-celled branches, single and terminal, or 

 lateral, or in pairs, clavate, 4-12 fi diam., 20.4-23.5 ju. long; empty spo- 

 rangia often proliferating into new ones, or into vegetative filaments; a 

 pyrenoid visible in some of the cells. 



This new form differs from typical P. maritima in that its thallus 

 forms an extended layer and does not become rounded and gelatinous. 

 The erect filaments are slightly narrower than in the typical form, 5.1- 

 7.7 jx against 6-10 fi, and the sporangia may occur in pairs, which does not 

 appear to be the case in the typical form. 



Mexico: Is. Revilla Gigedo, in dead shells from tide pools, I. 

 Clarion, no. 39-4 p.p. (TYPE), (det. F. Thivy), 1 Mar. 1939. Ecua- 

 dor: Archipielago de Colon, in dead shells, Ba. Cartago, I. Isabela, no. 

 34-352 A p.p. (det. F. Thivy), 25 Jan. 1934. 



Pilinia Lunatiae Collins, n. f . simplex F. Thivy^^* 



Plants bright green, growing on the cuticle of a Porella-\\k.& bryozoan ; 

 disc centrally distromatic, of 2.5-11.8 ja semi-isodiametric cells, of one 

 layer at the margin with cells 2.5-3.5 /* diam., 2-4 times as long; later 

 with central cells empty; erect filaments reaching 150 /i in length, usually 

 of 5-10 cells, unbranched, loosely arranged, with the cells at the base 4.70- 

 5.88 IX diam., up to 12.9 /x long, 1-2 times as long as wide, but above 5.88- 

 8.23 JU, diam., and up to 33 /* long, being 2.5-5.0 times as long as wide, 

 with the terminal cell transforming into a sporangium; cells (stained) 

 showing a pyrenoid. 



43 Pilinia maritima (Kjellm.) Rosenv., n. f. pacifica F. Thivy — Thallis extensis 

 tenuiter applanatis 0.5-1.0 mm diam.; filamentis erectis 0.2-0.4 mm longis, 5.1-7.7 (x 

 diam., in pilis gradatim angustatos desinentibus ; sporangiis singulis vel interdum 

 binis. Planta typica in loco dicto I. Clarion, Mexico, legit W. R. Taylor no. 39-4 

 (p. p.), 1 Mar. 1939. 



44a Pilinia Lunatiae Collins n. f. simplex F. Thivy — Filamentis erectis simplici- 

 bus, pleriimque 5.88-8.23 \i diam., 5-10 cellularibus, rarissime ad 13 cellularibus, 

 laxe dispositis. Planta tvpica in loco dicto Panama City, Panama, legit W. R. 

 Taylor no. 39-149 p.p., 31 Mar. 1939. 



