810 



MACROSCOPIC AND MICROSCOPIC CHARACTERS OF PLANTS. 



number of hairs on the concave inner surface of the 

 labellum ; number of hairs on the rim of the labellum. 



(4) Intermediate: In the color of stem; amount of 

 ridging of internodes; amount of swelling at nodes $ ; 

 diameter of the internodes at the narrowest part 3 ; 

 width of petiole $ ; flowering .period 3 ; waviness of mar- 

 gin of petals; length 9 and width of labellum; depth 

 of labellum ; apex of labellum ; color of concave face of 

 column ; color of anther case ; width of velamen 9 ; width 

 of endodermal cells 9 , diameter of vascular cylinder 9 , 

 number of protoxylem patches in the transverse section 

 of the roots; character of the tissue at the transverse 

 section of the stem at the third node ; width $ , depth $ , 

 of the epidermal cells, depth of cuticle, shape of hypo- 

 dermal cells, comparative widths of sclerenchyma and 

 xylem, and diameter of the largest vessels 3 , on the 

 transverse section of the stem at the third internode ; 

 thickness of the cell walls 9 , length 9 , of the upper 

 epidermal cells of the leaf at the apex ; length 9 of the 

 upper epidermal cells of the leaf at the base; length 3 

 of the lower epidermal cells of the leaf at the base ; depth 

 of the upper epidermal cells above the midrib 3 in the 

 transverse section of the lamina ; depth $ , width 9 , of 

 the upper epidermal cells on the transverse section of 

 the lamina halfway between the midrib and the margin ; 

 length 9 , width of the lower epidermal cells at the base 

 of the petiole ; number of sunken epidermal cells at the 

 top of the petiole on the lower epidermis; length of the 

 upper epidermal cells at the base of the petiole 9 ; length 

 of the lower epidermal cells of the lateral sepals 9 ; 

 length 3 , width 9 , of the lower epidermal cells on the 

 tubular part of the labellum ; number of hairs 9 , length 

 of hairs 9 , and color of the outer surface of the tubular 

 part of the labellum ; length of hairs 3 , and color of the 

 concave inner surface of the labellum ; length of hairs on 

 the rim of the labellum 3 ; width of upper epidermal 

 cells 9 , length of hairs $ , number of hairs 3 , on the 

 upper epidermis of the labellum at the apex. 



(5) Higher than either parent: In the color of 

 pedicels 9 = 3; color of sepals 3 ', color of petals 3 ; 

 color of rim 3 and apex 9 = 3 ; of labellum number 9 = 3 

 and size of starch grains 9 in the transverse section of 

 the stem at the third node ; width 3 , and depth 9 , of hy- 

 podermal cells in the transverse section of the stem at the 

 third internode ; number of sunken epidermal cells on the 

 upper epidermis of the leaf at the apex 9 , at the middle 



3 , and at the base 3 ', number of sunken epidermal cells 

 on the lower epidermis of the leaf at the apex 3 , at the 

 middle 3 , and at the base 3 ', number of stomata on the 

 lower epidermis of the leaf at the apex 9 , and at the 

 middle 3 ; length of the lower epidermal cells of the 

 petiole at the top 3 ; number of sunken epidermal cells 



9 at the ba.se of the petiole on the lower epidermis ; num- 

 ber of hairs 9 , at the top of the petiole on the upper 

 epidermis ; number of hairs 9 at the base of tfie petiole ; 

 color of the chromoplastsi 9 = 3 in the hairs on the rim 

 of the labellum ; length of the upper epidermal cells of 

 the labellum at the apex 9 ; color of the sap in the upper 

 epidermal cells of the labellum at the apex 9 = 3. 



(6) Lower than either parent: In the length of inter- 

 nodes 3 ; length of lamina 9 ; length of petiole 9 ; depth 

 of epidermal cells 9 , width of cortex 3 , depth of endo- 

 dermal cells on the transverse section of the root; size 

 of intercellular spaces 3 , and crowding together of bun- 



dles 3 , in the transverse section of the stem at the third 

 node ; width of bundles 9 in the transverse section of the 

 stem at the third internode ; width 9 of the upper epi- 

 dermis of the lamina at the apex ; length 9 , width 3 , 

 of the upper epidermis of the lamina at the middle; 

 length 9 , width 3 , of the lower epidermis of the lamina 

 at the apex ; length 9 , width 9 , of the lower epidermis 

 of the lamina at the middle ; width 3 of the lower epi- 

 dermal cells and number of stomata 3 at the base of the 

 lamina; depth of the ridges 9, depth of cells forming 

 the ridges 9 , depth of the lower epidermal cells 9 = 3, 

 depth 3 , width 9 , of the midrib bundle in the transverse 

 section of the lamina at the midrib ; depth of cuticle 9 , 

 length 9 = 3, width 3 , of the lower epidermal cells, 

 length 3 , of the sunken epidermal cells on the transverse 

 section of the leaf halfway between the midrib at the mar- 

 gin ; width of the lower epidermal cells at the top of the 

 petiole 9 = 3; length of hairs 3 on the upper epidermis 

 of tho. petiole ; width 9 of the lower epidermal cells of 

 the lateral sepals ; length 3 , width 3 , of the upper 

 epidermal cells of the lateral sepals ; width 9 , of the 

 lower epidermal cells of the petals ; length 3 , width 3 , 

 of the upper epidermal cells of the petals. 



TABLE J 42. Summary of characters of hybrid-stock as regards 

 sameness, intermediateness, excess, and deficit of development 

 in relation to parent-stocks. 



5. MACROSCOPICAL AND MICROSCOPICAL CHARACTERS 

 OF MlLTONIA VEXILLARIA, M. RCEZLIIj AND M. 



BLEUANA. 



(Plate 33, figs. 196 to 198. Tables J, 43 to 49; I, 5 and Summaries. 

 Chart F 5.) 



GENERAL DESCRIPTIONS. 



Data for the following descriptions were obtained 

 from Veitch (Manual of Orchidaceous Plants, II, 104, 

 110, 118), Curtis (Botanical Magazine, tables 6037 and 

 6085), Gardeners' Chronicle, 1889, 203, 749), and Sander 

 (Orchid Guide, 127, 127, 129). 



Miltonia vexillaria Nichols (Seed Parent) . Pseudo- 

 bulbs 1 to 1 and a half inches long, ovate-oblong, com- 

 pressed, bearing 1 leaf at the apex. Leaves 6 to 12 

 inches long, usually 6 to 8 to 1 growth, distichous and 

 alternate, inclosing the pseudobulb, linear-lanceolate 

 from a narrow sheathing base, darker green above, paler 

 and keeled beneath, the whole plant of a glaucous pea- 

 green color. Racemes usually 2 from the base of each 

 pseudobulb (sometimes more), slender, arching, longer 

 than the leaves, sheaths small, 4 to 7 flowered. Flowers 

 borne on pedicels that are longer than the bracts, largest 

 of the genus, 3 to 4 inches across but variable in size and 

 color; perianth flat; sepals obovate-oblong, subacute or 

 truncate, flat rather recurved, very pale rose; petals 

 similar in shape to the sepals, larger or smaller, deep 

 rose in color, deeper toward the base, and with a broad 

 white margin ; labellum suborbicular, 2-lobed in form by 



