44 Allan Hancock Pacific Expeditions vol. 26 



or sparingly branched, the branches erect, the apical cells long, obtuse; 

 sporangia unilateral on the erect branches, on 1-2-celled, upcurved 

 pedicels, tetrahedral, oval, about 28 p in diam., 42 p long; spermatangia 

 in clusters terminating the erect axes or lateral branchlets, the clusters 

 cylindric-oval, (80) 100-115 p long, 35 p in diam.; cystocarps terminal 

 on the erect branches or few-celled lateral branchlets, the pericarp-like 

 investment turbinate, to 175 p in diam., 150 fx long (to 138 p long, 110 

 p wide in Mexican specimens), (modified after Taylor). 



Type: Taylor 34-495B p.p., Feb. 12, 1934, in Herb. A. Hancock 

 Foundation. 



Type locality: Forming tufts, Isla Gorgona, Valle, Colombia. 



Mexican distribution: Baja Calif. — D. 3321b, Cabeza Ballena; 

 D. 3239, 3265, Punta Palmilla; D. 3106, Cabo Pulmo. 



Tiffaniella saccorhiza (S. & G.) Doty & Menez 

 P. 16, fig. 2 



Doty & Menez 1960, p. 135-144, fig. 1-4. Spermothamnion saccorhiza (Setchell 

 & Gardner) Feldmann-Mazoyer 1942, p. 16. Pleonosporium saccorhiza Setchell 

 & Gardner 1930, p. 168. 



Thalli monosiphonous, uncorticated, consisting of an extensive, 

 branched, creeping portion attached to the host by numerous penetrating 

 rhizoids from below, and of erect axes arising from the creeping portion ; 

 erect parts 2-3 mm. high, subdichotomously branched, 26-30 p in diam. 

 at the base, tapering but very slightly to the blunt apices; cells 8-12 

 diameters long; rhizoids prolonged, pink colored, consisting of single 

 cells 300-500 p long, very much swollen in the middle, terminating in 

 an irregularly saccate swelling; polysporangia sparse, 2-3 arising on 

 short branches in the lower and upper parts of the plant, spherical to 

 slightly elongated, on 1-celled pedicels, 75-85 p in diam., with 

 approximately 32 spores and with thick walls; spermatangia borne on 

 solitary, terminal stichidia from the lower parts of erect systems; 

 carpogonial branches subterminal, the gonimoblast without a conspicuous 

 central fusion cell. 



Type: H. L. Mason 37, April, in Herb. California Academy 

 of Sciences (173630). 



Type locality: Growing on Codium sp., Isla Guadalupe, Baja 

 Calif., Mexico. 



Mexican distribution: Pacific Baja Calif. — D. 10040 (on 

 Codium fragile, D. 10292 (on C. hubbsii, "Velero Point" about 10 mi. 

 west of Punta Malarrimo. 



This segregate from Spermothamnion shows many resemblances to 

 S. snyderae, and the basis of generic distinction has not yet been well 

 tested. 



