188 
7. HEXALECTRIS, Raf. 
flexalectris aphyllus, Raf. Testa elliptical, obtuse, about twice 
as long as thick, averaging 0.485 X 0.221 mm. Cells elongated, 
becoming polygonal towards apex, about three times as long as 
wide, averaging 0.065 X 0.0196 mm. Inner cell wall marked by 
excessively branching lines. (Plate CLI, figs. 8, 8a.) 
7A. BLETIA, R. P. 
Lletia verecunda, Sw. Testa obovoid, about one and a half 
times as long as thick, averaging 0.231 X 0.171 mm. Cells poly- 
gonal, about one and a half times as long as broad, averaging 
0.061 X 0.041 mm. Added for comparison with Hexalectris. 
(Plate CLI., fig. 9.) 
8. LisTERA, R. Br. 
Listera cordata (L.) R. Br. Testa oblong-fusiform, about three 
and one-half times as long as thick, averaging 0.845 < 0.25 mm. 
Cells square or polygonal, about one and a half times as long as 
wide, averaging 0.032 X 0.025 mm. (Plate CLI, fig. 10.) 
Listera australis, Lindl. ‘Testa subrotund, about one and a half 
times as long as thick, averaging 0.362 X 0.20 mm. Cells poly- 
gonal, rather longer than broad, averaging 0.036 X 0.028 mm. 
(Plate CLI, fig. 11.) 
Listera convallarioides (Sw.) Nutt. Testa obovoid, about 
twice as long as thick, averaging 0.412 X 0.207 mm. Cells poly- 
gonal, somewhat longer than broad, averaging 0.034 X 0.026 mm. 
(Plate CLI., fig. 12.) 
g. GyRostTacuys, Persoon. 
Gyrostachys cernua (L.) Kuntze. (Spiranthes cernua, Richard.) 
Testa oblong, contracted towards apex, over four times longer 
than thick, averaging 0.541 X 0.112 mm. Cells regular, oblong, 
shorter towards apex, about seven times longer than wide, averag- 
ing 0.132 X 0.019 mm. Inner cell wall marked by delicate, paral- 
lel, subdistant lines. (Plate CLL, figs. 13, 1 3a.) 
10. PERAMIUM, Salisbury. 
Peramium repens (L.) Salisb. (Goodyera repens, R. Br.). Testa 
elongated, slightly fusiform, about seven times longer than thick, 
averaging 0.877 X 0.123 mm. Cells square to oblong, somewhat 
irregular, about three times longer than broad, averaging 0.052 * 
0.019 mm. (Plate CLI, fig. 14.) : 
