310 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Fig. 41. 
Fig. 42. 
Fig. 43. 
Fig. 44. 
Fig. 45. 
Fig. 46. 
Fig. 47. 
Fig. 48. 
Fig. 49. 
Fig. 50. 
Fig. 51. 
Fig. 52. 
Fig. 53. 
Fig. 54. 
Fig. 55. 
Fig. 56. 
Naias Jlexilis. Superficial appearance of the base of the trichome. 
X 315. 
N. Jlexilis. Side view of the base of the trichome. X 315. 
Scigittaria Eatoni. Surface of the epidermis near the apex of the root, 
showing the youngest stages of the trichoblast (as at T). X 220. 
S. Eatoni. Radial longisection of epidermis showing the origin of the 
trichoblast (T). X 300. 
S. subulata. Trichoblasts and atrichomic cells in radial longisection 
slightly stained with iodine. X 260. 
S. subulata. Trichome. X 260. 
S. lancifolia. Surface of the epidermis, 0.4 mm. from the growing 
point. X 260. 
S. lancifolia. Base of trichome in profile. X 260. 
Limnobium spongia. Optical radial longisection of living epidermis. 
T, trichoblast. X 160. 
L. Spongia. Superficial view of the same. T, trichoblast. X 160. 
L. Spongia. Young trichome. X 560. 
Juncus arcticus. Origin of the trichoblasts. Superficial view of the 
epidermis near the apex. T, trichoblasts. X 410. 
J. acuminatus. Trichoblast and intervening cells in profile, 0.3 mm. 
from the growing point. Division at d. X 300. 
Luzula sudetica. Surface of epidermis very near root tip. Lately 
formed trichomic cells (as at T). X 410. 
L. campestris. Divisions of the trichoblasts. Superficial view„of 
the young epidermis. X 410. 
L. comosa. Base of mature trichome. The second trichome of the 
pair is shown in broken line. X 220. 
PLATE 18. 
Fig. 57. 
Fig. 58. 
Fig. 59. 
Fig. 60. 
Fig. 61. 
Fig. 62. 
Fig. 63. 
Fig. 64. 
Cyperus rivularis. Optical longisection of parts of a rootlet. The 
first trichoblast at T. Trichomic cells are distinguished by 
dense contents. X 300. 
C. alter nifolius. Trichomes and non-piliferous cells in profile. 
C. alter nifolius. Trichoblasts in profile, 0.5 mm. from the apex. X 
300. 
Carex crinita. Alternation of short and long (trichomic and atri¬ 
chomic) cells in the young epidermis. X 315. 
C. crinita. Young trichome and hairless cells in profile. X 315. 
Ehynchospora fusca. Surface of the root, 1 mm. from the apex, 
showing trichoblasts. X 300. 
Scirpus maritimus. Profile of epidermal cells below the region of 
root-hairs. Trichoblasts distinguished by contents and by color 
of walls, x 300. 
S. maritimus. Base of trichome and elongated non-piliferous cell 
in longisection. X 300. 
