. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 75 completely so below. D. 9670, 9701, outer peninsula at Bahia San Quintin; D. 1147, 8907, Punta Baja; D. 8701, Bahia Rosario. Ptilota filicina (Farl.) J. Ag. PL 33, fig. 3-4 J. Agardh 1876, p. 76; Dawson 1949, p. 220. Ptilota plumosa var. filicina Farlow 1875, p. 374. Thalli usually 10-35 cm. tall, bright red, with several long branches and these with 2-4 orders of branching; branches with leaflets and un- branched branches in opposite pairs and regularly alternate; leafle
. Allan Hancock Pacific expeditions. [Reports]. Scientific expeditions. NO. 1 DAWSON: MARINE RED ALGAE OF PACIFIC MEXICO 75 completely so below. D. 9670, 9701, outer peninsula at Bahia San Quintin; D. 1147, 8907, Punta Baja; D. 8701, Bahia Rosario. Ptilota filicina (Farl.) J. Ag. PL 33, fig. 3-4 J. Agardh 1876, p. 76; Dawson 1949, p. 220. Ptilota plumosa var. filicina Farlow 1875, p. 374. Thalli usually 10-35 cm. tall, bright red, with several long branches and these with 2-4 orders of branching; branches with leaflets and un- branched branches in opposite pairs and regularly alternate; leaflets slightly falcate, with both margins serrate, the tips acute; branches opposite the leaflets frequently 2-5 cm. long and with well-developed leaflets; tetrasporangia elliptical, about 65 jx long, scattered among branchlets in special branches from adaxial margin of leaflets, these tufted, multifarious, of incurved, mostly uniseriate short filaments; cystocarps borne on ultimate branchlets, modifying them to appear as shortly-pedicellate, tufted bodies about 500 /x in diam. consisting of a spherical gonimoblast surrounded by a clasping involucre of short fila- ments. Type: A collection by Capt. Pike, labeled "Ptilota californica var. concinna" in Herb. Harvey, Trinity College, Dublin. Type locality : Golden Gate [San Francisco], California. Mexican distribution: Pacific Baja Calif.—D. 5156, Cabo Colnett; D. 124, Rio San Telmo; D. 8734, 9683, outer peninsula of Bahia San Quintin; D. 8906 Punta Baja. DELESSERIACEAE Key to the Genera in the Mexican Flora 1. Apex with horizontally divided primary apical cell 2 1. Apex without a horizontally divided primary apical cell 16 2. Intercalary divisions absent in cell rows of the first order 3 2. Intercalary divisions present in cell rows of the first order 9 3. All tertiary apical cells reaching the thallus margin 4 3. Not all tertiary apical cells reaching the thallus margin 5 4. Thallus branching from the margins Branchiogl
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