Listrostachys.] cxxxiii. orchide^ (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, Krdnzl. in Engl. Pfl. Ost-Afr. C. 158. 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 5 large rounded lobes ; spur 

 subulate, longer than the lip. Column stout. — Kranzl. in Engl. Jahrb. 

 xxii. 28. 



Wile ]Land. British East Africa : Mpororo ; Kyenkesi, Nyavehasi Mountain, 

 G200 ft., hanging from trees like the lichen, Usnea harlata, Stnhhnann, 2229, 



Only known to me from the original description. Said to be almost exactly like 

 the West African Z. suhxdata, Reichb. f., but twice as large. The leaves are not 

 described. 



IB. MYSTACIDIUM, Lindl. ; Benth. et Hook. f. Gen. PI. iii. 584. 



Sepals and petals subequal, free, spreading or subconnivent. Lip 

 aflixed 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; clinandriumi truncate, entire. Anther terminal, operculate, 

 incumbent, 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. Reicheubach unites 

 it with Lindley's genus AeranthtiSy which is quite distinct. 

 Leaves flat. 



Lip at least 2 in. long . . . , , , 1. M. infundihulare. 



Lip f-1^^ in. long. 



Spur 1 in. long ...... 2. M. Astroarche. 



Spur 6 in. long ...... 3. M. longicaudatum. 



Lip under -, in. long (unknown in 18). 

 Racemes short, few-flowered. 

 Spur filiform. 



Spur 8 in. long . . . . . . 4. Jf. KenicB. 



Spur under 2^ in. long. 



Leaves -^ in. broad . . . . . h. M. Q~ravenreuthii. 



Leaves 2^4 lin. broad. 



Roots and sheaths verrucose . . . Q. M. verrucosum. 



Roots and sheaths not verrucose. 



Leaves 3-4 in. long (Western species) . 7. M. Batesii. 

 Leaves 1^-2:^ in. long (Eastern species) . 8. M. Walleri. 

 Leaves ^-1 in. broad . . . . 9. Jf. longifolium. 



