26 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



to Fort Ross, but no observations are known to the writer 

 on the occurrence of N. corallinarum at any other place 

 than the type locality. 



Locality. — San Diego! (Mrs. E. Snyder in herb. F. S. 

 Collins). 



Nitophyllum uncinatum J. Ag. 



Spec. Gen. et Ord. Alg., Vol. II, Pt. 2, 1852, p. 654. 



Nitophyllum uficinattim McClatchie, A. J., Proc. So. Cal. Acad. Sci., Vol. 

 I, 1897, p. 358; also in Phyk. Bor.-Amer. Collins, F. S., Holden, I., 

 and Setchell, W. A., Fasc. VII, No. 337, 1897. Agardh, J. G., 

 Contin. Spec. Gen. et Ord. Alg., Vol. Ill, Pt. 3, 1898, p. 65. 



Synopsis. — Frond both prostrate and erect. Prostrate frond creeping, 

 narrow, linear, thin and membranous; frequently weathered, reduced, and 

 thickened along median portion, with microscopic veins, and with rhizoids; 

 margin entire, or toothed; branching, branches rising into erect fronds at 

 intervals. 



Erect frond sessile or subsessile, flat and linear, thin and delicate, some- 

 times thickened in median portion, with microscopic veins; branching sub- 

 dichotomously from the base upwards, with margin entire, or occasionally 

 toothed. Branches linear, occasionally expanded, or acuminate, frequently 

 recurved or hooked at apices. Veins microscopic, extending throughout 

 frond, occasionally branching and anastomosing. 



"Sporangia in solitary disc-like sori, on the upper branches " or "in round- 

 ed sori" on the outer branches. (See Remarks on Species.) Antheridia as 

 yet unobserved. Cystocarps minute, marginal or submarginal, produced at 

 infrequent intervals, projecting slightly beyond surface.' 



Rema?'ks on the Species. — N. uncinatum has a bright, 

 rosy red tint when alive, usually changing to a dull purplish 

 or brownish red when dried. The fronds may attain a 

 length of 10-15 cm. The plant is one of the more delicate 

 species of the coast, as may be seen in the thin and mem- 

 branous character of the frond. Throughout the narrow, 

 linear segments extend microscopic veins, which, with the 

 numerous recurved or hooked apices of the branches, may 

 be regarded as the prominent morphological characters.^ 



1 Account of cystocarps from specimen in Hauck und Richter, Phykotheca Univer- 

 salis. Fasc. VII, No. 306, 1889. 



- Nordhausen (Pringsheim's Jahrbiicher f. Wiss. Botanik, Band XXXIV, Heft 2, 1899 

 p. 263) finds that the hooked apices of the branches of N. ttnctnatum serve as climbing 

 organs. 



