GLOSSARY. 779 



Basidiospore. A spore which is borne on the basidium or spore-bearing 

 organ of the Basidiomycetes (p. 57). 



Basidium. An enlarged terminal cell, of the closely arranged hyphae, 



which produces by abstriction spores (p. 59). 



Bast (Bast fibers or Stereome). The fibers occurring in the bark asso- 

 ciated with the sieve tissue (p. 268). This is sometimes confused with 

 Liber and phloem, the former being more properly applied to the 

 bark, and the latter including bast fibers, sieve tubes and the accom- 

 panying cells. A distinction is also sometimes made between "soft 

 bast" and "hard bast," the former applying to the young fibers nearest 

 to the cambium and the latter to the older and more lignified fibers. 



Berry. A fleshy, indehiscent fruit, the seeds of which are embedded in 

 the sarcocarp (p. 410). The word berry as used in a horticultural 

 sense includes any small pulpy fruit, but many of these are not 

 technically classified as berries (p. 410). 



Bicollateral. Having two sides alike. Applied to a fibrovascular bundle 

 in which the xylem or woody portion lies between two layers of 

 phloem (p. 341). 



Biennial. Continuing or lasting for two years or parts thereof, i. e., 

 requiring two growing seasons for the completion of the life cycle 

 (p. 330). 



Bilabiate. An irregular corolla or calyx, whose lobes are so arranged as 

 to form an upper and lower lip, as in the Labiatae (p. 386). 



Blade. The lamina or expanded portion of a leaf or leaf-like organ, 

 as distinguished from the petiole or stalk (pp. 348 and 385). 



Bordered Pore. Distinguished from a simple pore in that the wall pro- 

 trudes forming a dome-shaped or blister-like extension into the cell, 

 giving the appearance of two concentric rings (p. 275). 



Bract. A more or less modified leaf subtending a flower or flo'wer cluster. 

 They are often inconspicuous, but sometimes petaloid or highly col- 

 ored as in the dogwood (p. 388). 



Bracteate. Having bracts. 



Bracteolate. Furnished with bractlets. 



Bractlet (Bracteole). A little bract situated on the flower-stalk or pedicel, 

 as in the pansy. 



Bud. An undeveloped shoot enclosed by closely appressed rudimentary 

 leaves. Applied to foliage as well as flower buds (p. 321). 



Bulb. A subterranean stem having the internodes much reduced and con- 

 sisting of closely appressed fleshy leaves (p. 327). 



Bulbiferous. Producing bulbs. 



Bulblet (Bulbel, Bulbil). A .small aerial bulb growing in the axils of 

 the leaves or developing in the place of the flowers (p. 327). 



Bulbous. Pertaining to or resembling a bulb. 



Rullate. Having blister-like elevations especially between the veins. 



Bursicle. Resembling a small pouch. 



Bursiculate (Bursiform). Saccate or pouch-like. 



Caducous. Dropping away early. Applied to the sepals of the Papavera- 

 ce?e. The word fugacious is often used in the same sense (p. 388). 



Calcarate (Saccate). Applied to the corolla when one of the petals is 

 furnished with a spur (p. 388). 



Calyx. The outer circle of the perianth of a flower (p. 402). 



Cambium. The meristematic or growing tissue which gives rise to the 

 tissues of the xylem and phloem ; in dicotyledons it forms a con- 

 tinuous ring between the wood and bark (pp. 314 and 341). 



Campanulate. Bell-shaped. Applied particularly to the corolla (p. 388). 



Campylotropous (Campylotropal). Applied to an ovule or seed which 

 is bent upon itself so as to bring the summit near the base (p. 379). 



