176 MR. H. BOLUS'8 CONTRIBUTIONS 
only one of the sheets in Thunberg's herb., namely the one 
containing the specimens also lately identified as D. Zeyheri, 
Sonder, by Mr. Brown. 
In November 1888 * Prof. Wittrock of Stockholm kindly sent 
over to the Kew herbarium the two sheets of type-specimens of 
D. porrecta in the Swartzian herbarium. An examination of 
these showed them to be identical with D. Zeyheri, Sonder. The 
flowers are indeed smaller than the usual size of those of D. 
Zeyheri, but in structure they agree. Sonder’s name will there- 
fore be reduced to a synonym of D. porrecta, Swartz. 
So far as is known at present D. ferruginea is an exclusively 
western plant, the easternmost recorded limit being Swellendam, 
Kennedy 31; while D. porrecta is an eastern plant, the western- 
most recorded limit being Long Kloof, near Groote River, 
Burchell 5014. The readiest character of difference is to be found 
in the spur, which in D. ferruginea tapers rapidly to a fine 
hair-like point, but in D. porrecta is longer and thicker and 
equally thiek to nearly the apex. In the first the petals are 
acuminate, in the second obtuse and sometimes bidentate. 
It may be useful to quote the following numbers oceurring in 
the Kew Herbarium :— 
D. ferruginea, Sw.: Burchell, 8199; Kennedy, 31; also the 
following, all distributed under the erroneous name 2. porrecta— 
MacOwan, 2419; Bolus, 4764; Herb. Norm. Austr.- Afr., 165. 
JD. porrecta, Sw.: Burchell, 4693, 5014 ; MacOwan, 1478 and 
1532; Bolus, 1298. 
Disa MACRANTHA, Sw. in Kongl. Vet. Acad. Handl. vol. xxi. 
(1800), p. 210. l 
Disa BRACTEATA, Sw. l c. p. 211. 
Disa LACERA, Sw. l. c. p. 212. 
It is desirable to place upon record that, according to inquiries 
kindly answered by Prof. Wittrock of Stockholm, types of these 
plants do not exist in the herbarium of Swartz. As they are 
also absent in Thunberg's herbarium, it is to be feared that the 
means of certain identification no longer exist. 
CORYCIUM TRICUSPIDATUM, Bolus, n. sp. (Fig. 13.) Herba 
glabra, erecta, 3:5 decim. alta, floribus exceptis siccitatione nigri- 
cans; caulis foliosus; folia plura, linearia, acuminata, laxa, ner- 
* After my note on this subject in * The Orchids of the Oape Peninsula ' 
(1888), p. 173, had already been printed. 
