ZYGOPETALUM. 49 



buff-yellow semi-circular crest occupying three-fourths of the area of the 



entire lip, deeply grooved longitudinally into numerous rounded ridges ; 



the small ovate blade with recurved margin and tip, and coloured Hke 



the sepals and petals. Column broad, arching, convex and bluish violet 



above, concave and yellow in front, hairy and spotted with red towards 



the base. 



Zj'gopetalum cceleste, Echb. in Gard. Chron. V. (1876) p. 756. BoUea ccelestis, 



Echb. in Gard. Chron. VII. (1877), p. 366. Bot. Mag. t. 6458. Eegel's Gartenft. 



1882, t. 1075. Godefroy's Orchidophile, 1882, p. 42. Paxt. Fl. Gard. re-issue, *I. 

 pi. 15. B. pulvinaris, Echb. Lindenia, II. t. 61. 



A most remarkable orchid on account of the unusual but very 

 handsome colour, as well as the large size of its flowers. Its history 

 was very imperfectly known till M. Roezl communicated to Godefroy^s 

 Orchidojjhile, in 1883, the following particulars of its habitat: — 



" On the route from Beneventura to Calli over the western Corddlera 

 of Colombia, at about 6,000 feet elevation, extend impenetrable forests 

 on the left side ; the place is called Salado, Some years ago I sent 

 my nephew, Edward Klaboch, for Masdevallia Cliimiera, which occurs 

 in great quantity and in great variety in this locaHty. He discovered 

 some tufts of a Pescatorea growing on a tree about a yard from the 

 ground. A Pescatorea at 6,000 feet elevation seemed to me to be somewhat 

 strange, and when visiting the same district in the following year I found 

 that it was Bollea ccelestis. 



The locality where this plant grows is rather cold during the night; 



the thermometer sinks to 8° — 10° C. (46° — 50° F.), and sometimes even 



lower; during the day it rises to 15°— 20° C. (60'— 72° P.). This 



difference between the day and night temperature causes a copious 



condensation of moisture, and even when it does not rain the plant is 



constantly damp. Its stout roots penetrate or creep under the rotten 



leaves of the different trees. Tufts 20 — 30 inches in diameter occur 



frec[uently with 30 — 40 flowers open at one time."* 



These particulars should afford a clue to the habitat of the plant_, 



and suggest its cultural treatment if re-discovered. It was introduced 



in 1876 by Messrs. Backhouse, of York, but it is now become very 



rare in British collections, if it has not entirely disappeared. 



Z. Dayanum. 



Pseudo-bulbs none. Leaves in tufts of 6 — 8, oblanceolate-oblong, 

 acute, equitaut at base, 10 — 15 inches long. Peduncles 3 — 4 inches 

 long, one-flowered, with a small green sheathing bract below the middle 

 and a larger bro'ftaiish one at the base of the ovary. Flowers 3 inches 

 across the lateral sepals ; sepals and petals fleshy, cream-white tipped 

 with jiale green ; the sepals oblong-obtuse, concave ; the pet;\ls about 



* Godefroy's Orchidophile, 1883, p. 507. 



