BOT.— Vol. I.] SAUNDERS— PHYCOLOGICAL MEMOIRS. 1 65 



47. Soranthera Post. & Rupr. 



Soranthera Post. &> Rupr., lUustr. Alg., 19, 1840. 



Plant body hollow, inflated, composed of two layers of tissue, with a corti- 

 cal layer of small, colorless cells, the inner of large, nearly colorless cells. 

 Unilocular sporangia forming sori which are distributed over the entire sur- 

 face of the plant ; paraphyses unicellular, hairs abundant in the center of each 

 sori ; plurilocular sporangia unknown. 



48. Soranthera ulvoidea Post. & Rufr. 



Plate XXIX, Figs. 4 and 5. 

 Soranthera ulvoidea Post. 6^ Rupr., 1. c. 



Plants gregarious, sessile, membranaceous, olive-green, globose or oval, 

 2-8 or 10 cm. high. Sori very abundant, evenly and closely distributed over 

 the whole surface of the plant. Unilocular sporangia clavate, yo-ioo/j'. lon^, 

 surrounded by numerous linear paraphyses which are nearly twice as long. 



In sheltered coves, usually on Rhodomela larix, occa- 

 sionally on rocks and other algge. Monterey, California. 



