Listrostachys. | CXXXIII, ORCHIDEE (ROLFE). 169 
River, on mangroves, Barter, 20125! Brass, Barter, 52 ; Fernando Po, growing pen- 
dant 7-8 ft. long, from branches of lofty trees, Barter ! 
The Fernando Po piece has longer and more slender leaves, but agrees in other 
respects, and I think belongs to the same species, 
52. L. filiformis, Kränzl. in Engl. D. Ost-Afr. C158: Racemes 
minute, small-flowered. Bracts and flowers very minute. Sepals ovate- 
triangular, acute. Petals linear. Lip cochleate, unguiculate at the 
base and concave, dilated in front into 2 large rounded lobes; spur 
subulate, longer than the lip. Column stout.—Kriinzl. in Engl. Jahrb, 
xxii. 28. 
Nile Land. British East Africa: Mpororo; Kyenkesi, Nyavehasi Mountain, 
6200 ft., hanging from trees like the lichen, Usnea barbata, Stuhlmann, 2229, 
Only known to me from the original description. Said to be almost exactly like 
the West African Z. subulata, Reichb. f., but twice as large. The leaves are not 
described. 
19, MYSTACIDIUM, Lindl.; Benth. et Hook. f. Gen. Pl. iii. 584. 
Sepals and petals subequal, free, spreading or subconnivent. Lip 
affixed to the base of the:column and continuous with it, produced at 
the base into a short or somewhat elongate spur; side lobes small, or 
obsolete, at the sides of the spur; limb spreading or erect, generally 
entire. Column very short, broad, concave in front, without wings and 
footless ; clinandrium truncate, entire. Anther terminal, operculate, 
meumbent, convex, often produced in front, scarcely 2-celled ; pollinia 2, 
globose, sulcate, situated upon a pair of slender stipites, which are attached 
to separate oblong or squamiform glands. Capsule oblong or fusiform, 
—Epiphytic herbs. Stems leafy, short or elongated, not thickened into 
pseudobulbs. Leaves distichous, coriaceous or fleshy, articulated to a 
persistent sheath. Peduncles lateral, simple. Flowers generally small 
or medium-sized, racemose or solitary. Bracts usually small. 
_ A genus of about forty species, mostly in Tropical Africa and the Mascarene Islands, 
with a few South African representatives and one in Ceylon. Reichenbach unites 
it with Lindley’s genus Aéranthus, which is quite distinct. 
Leaves flat, 
Lip at least 2 in. long . i ; e . 1. M. tnfuadibulare. 
Lip ł-14 in. long. 
Spur 1 in. long . i ; S ; : 2. M. Astroarche. 
Spur 6in. long . ; ; : 3 S 3. M. longicaudatum. 
Lip under 4 in. long (unknown in 18). 
Racemes short, few-flowered. 
Spur filiform, 
Spur 8 in. long . 5 $ S . 4, M. Kenia. 
Spur under 2} in. long. 
Leaves 3 in. broad 
Leaves 23 A lin. broad, 
Roots and sheaths verrucose 
Roots and sheaths not verrucose, 
Leaves 3-4 in. long (Western species) . 
Leaves 14-23 in. long (Eastern species) - 
Leaves }—1 in. broad . . b : 
Or 
. M. Gravenreuthit, 
M. verrucosum. 
M. Batesii. 
. M. Walleri. 
M. longifolium. 
oon 9 
