74 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



p. 227; Dawson, Neushul & Wildman 1960, p. 68, pi. 37, fig. 3-4. 



Thalli epiphytic, with an irregularly branched holdfast completely 

 embedded in the host, 5-12 cm. high, deep rose-red, with a percurrent 

 axis branching into several orders; branching regularly alternate, 

 distichous and all the branches lying in one plane; lower part of an 

 axis usually with longer branches and the whole shoot appearing 

 pyramidate; branches of the first second and third orders usually 

 straight, those of the ultimate orders curved and forcipate; cystocarps 

 restricted to branches of the final orders, with an involucre of 3-6 

 curved, corticated branchlets; tetrasporangia densely crowded beneath 

 the surface of all sides of the branches of the last three orders; sperma- 

 tangia not seen (modified from Smith) . 



Type : A collection by Thomas Coulter in the Harvey Herbarium, 

 Trinity College, Dublin. 



Type locality: Monterey, California. 



Mexican distribution: Pacific Baja Calif. — D. 102-45, D. 235 

 (Fork & Hommersand), Punta Descanso; D. 4 (Hubbs), Punta Clara; 

 D. 20, 55, 5167, 5170, Cabo Colnett; D. 135a (Fork), Rio San Telmo; 

 D. 20870 (Neushul), near Punta Cabras; D. 8769, 9651, outer peninsula 

 of San Quintin; D. 1131, 1132, 1257, 1295, 8675, 8839, 8855a, Punta 

 Baja; D. 1487, Punta Santa Rosalia. 



Neoptilota densa (C. Ag.) Kylin 

 PI. 33, fig. 1-2 

 Kylin 1956, p. 393. Ptilota densa C. Agardh 1822, p. 387; Dawson 1949. p. 

 223. 



Thalli 10-25 cm. tall, dull brownish red, with an obscure main axis, 

 several of the lower branches often equalling it in length; sides of axis 

 and major branches densely fringed with leaflets and very short branch- 

 lets bearing leaflets; leaflets and short branchlets in opposite pairs 

 and regularly alternate; leaflets falcate, with the adaxial margin smooth 

 and concave, the abaxial margin strongly serrate and convex; cystocarps 

 borne at tips of short, fringing branchlets, globose, about 150 /j. in diam., 

 surrounded by an involucre of incurved rays; tetrasporangia elliptical, 

 30-45 [x in diam., borne in dense clusters on short branchlets opposite 

 falcate leaflets and appearing to be in their axils, also in part on short 

 branchlets from basal margins of leaflets. 



Type: A specimen marked "e coll. Haenkiana" in Herb. Agardh, 

 Lund, Sweden. 



Type locality: Monterey Peninsula, California. 



Mexican distribution: Pacific Baja Calif. — Cooper 776, Punta 

 Santo Tomas; D. 6439, Bahia Colnett (This is an unusually finely dis- 

 sected example. The falcate "leaflets" are not abaxially serrate, but 

 actually branched so that the "leaflet" aspect is nearly lost above, and 



