314 THE ORCHID REVIEW. 
angustatum, and not distinguishable by any well-marked character. O. 
angustatum was originally described in 1837, from a dried specimen 
collected by Colonel Hall in the valley of Lloa, near Quito, in Ecuador, at 
8,000 feet above sea-level (Lindl. Bot. Reg., xxiii., sub t. 1992). Nearly 
twenty years later it was introduced to cultivation by Mr. Lehmann, 
through Messrs. Hugh Low & Co., of Clapton (see Rchb. f. in Gard. Chron., 
1878, i. p. 138). O. claviceps was also introduced through the same 
agencies, and probably at the same time. It was described by Reichenbach 
from a sketch and dried materials (Gard. Chron., 1876, ii. p. 516), living 
plants also being sent, which flowered shortly afterwards. The identity 
of O. angustatum has been somewhat obscured, owing to the way it has 
been confused with the allied O. ramosissimum, but on examination of a 
series of specimens it is evident that O. claviceps is synonymous, and, 
indeed, from the very first no clear differences were pointed out. The 
latter name may therefore be dropped. O. angustatum has long and 
narrow yellow sepals, marked with light dusky brown up the middle ; 
curved lanceolate undulate petals, barred and spotted with light brown ona 
yellow ground; and a narrow lip of similar colour, with a crest of many 
acute teeth, which are whitish in front, and partially suffused with faint 
purple. The column is nearly wingless. It is an interesting species, 
though not one of the showy ones. 
CALENDAR OF OPERATIONS FOR OCTOBER. 
By H. A. BURBERRY, Highbury, Moor Green, Birmingham. 
THE prevailing fine weather during the month of September must have 
been most welcome to Orchid growers, for it has undoubtedly rendered 
them most valuable service, by assisting the plants to complete and nicely 
mature their pseudobulbs. At the time of writing the thermometer outside 
has registered as high a degree of temperature as at any time during the 
summer, thus enabling us to ventilate in all departments very much as one 
would do for hard-wooded greenhouse plants. Such are indeed glorious 
times for Orchids, for it is then that they thrive so well, and soon show 
that sturdy natural appearance which augurs well for a safe and prosperous 
journey through the winter months. May such weather continue, and the 
longer the better ! 
But by the time these lines appear we shall have entered upon the 
month of October, and if we have not then encountered colder and less 
genial weather, it will probably not be far away, and we must then be much 
more careful in the matter of ventilation, in watering and damping down, 
and in the temperatures generally. The thermometer must then in each 
division indicate a figure suitable for the autumn. The following isa guide :— 
