48 



MEMOIRS OF THE NEW YORK BOTAXICAL GARDEN 



sepiments, especially at the nieristeniatic ends, not attenuated; 

 cells aeruginous, quadrate, cross-walls plainly visible; apical 

 cells rounded; sheath scarcely discernible, except in the very 

 oldest parts, hyaline; branching very sparse. 



Growing on the wall of a house in Maricao, no. 1049 b, type. 



Symploca Willei sp. nov. 



Plate 10, figure 92 



Filaments more or less flexuous, forming a thin, compact 

 stratum, intricately intertwined, and at times forming definite 

 f uniculate strands ; trichomes 3.5-3.7 p diam., not constricted ; 

 apices straight, not attenuated; cells quadrate, varying to 

 slightly shorter or longer, mostly free from granules, with a 

 more or less deiinitely clear area in the center ; pale aeruginous, 

 tinged with yellow; cross-walls very thin, apical cell blunt to 

 subcorneal ; end wall rarely slightly thickened ; sheath thin, dis- 

 tinct, hyaline, homogeneous. 



Growing on earth in Ttuado, no. 1491, type; on tree trunks, 

 Coamo Springs, no. 281 a. 



Symploca Willei, as represented by the specimen upon which 

 it is founded, is hardly typical of the genus. The branching 

 characteristic of the genus is not evident in the specimen. How- 

 ever, that is not an unusual condition. The typical, fasciculate 

 habit of the genus is not well represented, although the filaments 

 are sufficiently entwined into small funicular strands to relate it 

 to the genus Symploca, but very close to the genus Phormidium. 



Symploca symbiotica sp. nov. 



Plate 10, figure 93 



Filaments forming dense spindle-shaped fascicles by grow- 

 ing into the gelatinous tegument of the host, extending its entire 

 length, and in many instances destroying it, moderately straight 

 and parallel, up to 200 associated in a fascicle ; trichomes pale 

 aeruginous, tinged with yellow; neither constricted nor tapering 

 at the apices, 0.6-0.8 m diam. ; cells 3-5 times as long as the diam- 

 eter, homogeneous ; sheath very thin and hyaline ; not discern- 

 ible when within the gelatinous tegument of the host. 



Growing in association, for the most part within the sheath 

 of Microcoleus sociatus G. S. West, on a wall in Fort San Cris- 

 tobal, San Juan, no. 2021 b, type. 



