40 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



blunt, terminal wall slightly thickened; sheath hyaline, chang- 

 ing to yellowish or brown, homogeneous, becoming lamellose in 

 part, and rarely somewhat ocreate. 



Growing on damp earth by Playa, Fajardo, no. 710 h, type. 



Lyngbya magnifica sp. nov. 

 Plate 8, figure 79 



Filaments long, relatively straight and rigid, 32-40 \i diam., 

 forming a thin, loose stratum; trichomes 28-36 |j diam., not at- 

 tenuated at the apices, not constricted at the dissepiments, dense 

 purplish violet; cells 3.8-5 m long, protoplast homogeneous, 

 apical Avail convex, terminal wall in part slightly thickened; 

 sheath 2-2.5 \i thick, hyaline, smooth, homogeneous. 



Growing in a water reservoir at Rio Piedras, no. 105, type. 



Lyngbya splendens sp. nov. 



Plate 9, figure 81 



Filaments forming a thin pannose stratum on the surface of 

 the soil, long, relatively straight, gently arcuate, 17-20 p diam. ; 

 trichomes 14-16 n diam., not constricted ; apices not attenuated ; 

 cells one-fourth to three-fourths as long as broad, uniformly and 

 very tinely granular, color aeruginous, cross-walls very thin but 

 distinct ; apical cell rounded, at times slightly narrower ; termi- 

 nal wall not thickened ; sheath thin, smooth, homogeneous, hya- 

 line at first, changing to salmon-pink. 



Growling on tree trunks on the way towards Monte Montoro, 

 Maricao, no. 1072, type. 



Lyngbya splendens seems to be a very distinct species. The 

 color of the sheath resembles that of some species of the genus 

 Porphyro siphon, but structurally it is more like a typical Lyng- 

 bya sheath. The trichomes are typical of the genus Lyngbya. 

 It is probably closely related to L. major. 



Lyngbya epiphytica aquaedulcis var. nov. 



Filaments adhering firmly to the filaments of the host ; tri- 

 chomes 0.8-1.2 M diam. ; cells quadrate or less, otherwise as the 

 species. 



Growing on the filaments of Lyngbya majuscula in a brook, 

 San Lorenzo, no. 494 a, type. 



