242 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



KEY TO GENERA 



1. Blade little and only marginally proliferous, dichotomous to poly- 

 chotomous, the segments strap shaped to sublanceolate, the sorl 

 somewhat swollen Chondrus 



1. Blades subspinulose or much proliferated from faces and edges, 

 variously and often copiously divided, the segments terete to 

 foliar, the proliferations usually nodular to terete, in part con- 

 taining the cystocarps Gigartina 



CHONDRUS Stackhouse, 1797 



Plants bushy, slender and compressed below, the branches flattened 

 above, linear to broadly cuneate, repeatedly dichotomous, firmly mem- 

 branous to subcartilaginous ; structurally showing a filamentous medulla 

 with lateral radial filaments forking dichotomously to produce a small- 

 celled cortex; sporangia tetrapartite, formed in obvious sori in the 

 medulla, the fertile areas somewhat swollen ; spermatangia in superficial 

 sori on young branches ; cystocarps soriform, in the medulla. 



KEY TO SPECIES 



1. Basal segment near the holdfast compressed to subcylindrical, 

 the upper segments of the branches to 8-12 mm wide C. Hancockii 



1. Basal segments short, flat, irregularly closely branched, the upper 

 segments of the branches sparingly divided, to 2-3 cm wide . . 

 C. albemarlensis 



Chondrus (?) Hancockii n. sp.^*^ 

 Plate 81, Fig. 1 



Plants to 12 cm tall, olive or blackish when fresh, drying dull reddish 

 purple, below cartilaginous, above fleshy membranous; holdfast small, 

 lower axis compressed, about 1 cm above the base becoming flat and 0.5- 

 0.7 cm broad, above complanately branching 4-6 times dichotomously or 

 occasionally unilaterally, reaching 8-12 mm broad above the forks, and 

 strap shaped, the apices rounded, margins plane or a little undulate ; pro- 



148 Chondrus Hancockii n. sp. — Plantae ad 12 cm altitudine, infra compressae, 

 supra complanate atque 4-6-dichotome ramosae, ad 8-12 mm latitudine, ligulatae, 

 apices rotundatos et margines pianos ad subundulatos habentes; nematheciis dis- 

 persis, 0.3-1.0 mm diam. ; in structura corticera externum constantem e 2-3 stratis 

 cellularum praebentibus. Planta typica in loco dicto I. Santa Maria, Ecuador, 

 legit W. R. Taylor no. 34-392, 30 Jan. 1934. 



