112 GIGARTINACEAE 
The cystocarps of the Ahnfeltia are deep-seated, often reaching | 
the central axis of the medulla, and are wholly destitute of any 
special pericarp; as they approach maturity, irregular usually 
inconspicuous pores are formed, commonly several to a cystocarp,* 
leading through the cortex to the surface; the walls of these canals | 
sometimes become colored a brownish yellow, apparently through 
decay of the abutting cells. In the early stages of the formation of 
the cystocarp, delicate hyphae, suggesting the presence of a para- 
sitic fungus or alga, may be seen running among the larger cells 
and sometimes apparently fusing with them; these we take to be 
the sporogenous filaments, though we have not been able to follow 
out their history and connections with full satisfaction. 
PLATE 44. Ahnfeltia Durvillaei i 
Photograph of a cystocarpic specimen (Coker 119 р.р.--пош liquid preservative)» 
natural size. 
PLATE 45, FIGURE A. Ahnfeltia Durvillaei 
A photograph taken by Dr. Coker (apparently at low tide), showing the cushions 
formed by this species as it grows on surf-washed rocks at Lobos de Afuera (Coker — 
139 p.p.). 
PLATE 46. Ahnfeltia Davila 
Photograph of a sterile specimen (Coker 193h—from liquid preservative), Фа 
fering somewhat in habit from the cystocarpic specimen shown in plate 44; natural 
size 
Ahnfeltia Polyides Aresch. appears to have come from the 
Chincha Islands, and, according to material distributed by Ares- 
choug, consisted of typical А. Durvillaei and other specimeni 
approaching the following variety: 
Ahnfeltia Durvillaei implicata (Kütz.) comb. nov. 
Tylocarpus implicatus Kütz. Phyc. Gen. 411. 1843. | 
Gymnogongrus implicatus Kiitz. Sp. Alg. 789. 1849; Tab. Phys 
19: 25. pl. 69. f. а-с. 1869. 
Differing from the type in denser habit of growth, the more 
frequent and close-set dichotomies (often pseudo-3-4-tomo 
and the intricate often deflexed branches. 
On rocks, San Lorenzo Island, region of са 
~ 
+ The carpostomes аге less numerous and less conspicuous and the 
less central or axial than is indicated by Ada S. McFadden (Univ. California Publ. 
Bot. 4: pl. 18. f. г. тотт) in her figure of a section of a cystocarp of à a Cali 
specimen referred to Ahnfeltia gigartinoides J. Ag. 
