192 CXXXIII. ORCHIDEE (ROLFE). | Holothrix. 
segments; spur narrowly subconical, subobtuse, membranous, 1}-1} 
lin. long. Column very short and stout.—Peristylus arachnoideus, A. 
Rich. in Ann. Sci. Nat. sér. 2, xiv. 267; A. Rich. Tent. Fl. Abyss. ii. 
289; Reichb. f.in Walp. Ann. iii. 583. Holothria arachnoidea, Durand 
& Schinz, Conspect. Fl. Afr. v. 69, in part. Platanthera arachnoidea, 
Engl. Hochgeb. Fl. Trop. Afr. 179. 
Wile Land. Abyssinia, Schimper, 504! 
4, H. vatkeana, Reichb. f. in Journ. Bot. 1876, 346. Plant over 
1 ft. high, slender. Leaves, peduncle, bracts, and ovary pilose; flowers 
glabrous. Tubers ovoid-oblong. Leaves 2, radical, spreading, ovate or 
ovate-oblong, subobtuse or apiculate, 1—14 in. long, 8 lin. broad. Scapes 
over 1 ft. long, sparsely pilose. Racemes 3 in. long, lax, many-flowered ; 
flowers subsecund. Bracts triangular-lanceolate, acute, 14 lin. long. 
Pedicels 14 lin. long. Sepals triangular, acute, 3 lin. long. Petals 
lanceolate, 2 lin. long; apex caudate-acuminate. Lip 14 lin. long, 
trifid to the middle; lobes linear, subacute; spur conical-oblong, 
incurved at the apex, scarcely } lin. long.—Reichb. f. Otia Bot. Hamb. 
ii. 72. Schweinf. in Bull. Herb. Boiss. ii. App. ii. 87, 112. € 
Wile Land. Eritrea: Ambelaco, near Maldi, 6500 ft., Schweinfurth, 159 ; Plateau, 
of Kohaito, 8400 ft., Schweinfurth, 160 ; Asmara, 8100 ft., Schweinfurth, 548; Geleb, 
on the River Sabber, 6500 ft., Schweinfurth, 1536; Peak of Alamkale Mountain, 
5900 ft., Schweinfurth, 1629. Somaliland; Serrut Mountains at Meid, on limestone, 
1800, Hildebrandt, 1465! 
Also found in Arabia. 
5, H. Usambare, Kränzl. in Engl. Jahrb. xix. 248. Leaves 2, 
subopposite, or rarely 3, oblong or oblong-lanceolate, acute or acuminate. 
Scapes about 9 in. long, naked below, sparsely pilose above with glandu- 
liferous hairs, and two or three minute sheaths; spikes secund, 6-20- 
flowered. Bracts lanceolate, acuminate, one-third as long as the ovary. 
Dorsal sepal broadly ovate, cucullate, acute ; lateral semioblong, with 
arching nerves, acute. Petals much smaller than the sepals, oblong, 
acute, one-nerved. Lip simple, cuneate; apex retuse, tridentate or 
obscurely trilobed; spur filiform, deflexed or incurved, 4—2 as long as 
the ovary. Column short and stout. 
eee Dist. German East Africa: Usambara ; high region, in gravel, Holst, 
Only known to me from the original description, but said to have the habit 
of H. orthoceras, Reichb. f. 
6. H. arachnoidea, Reichb. f. Otia Bot. Hamb. ii. 107 (excl. syn-)- 
Leaves 2, equal, ovate, transverse, subacute or the upper one acute, 
areolate when dried, as in Satyrium; base subcordate. Peduncle 
elongate, hispid with deflexed hairs; spikes 6-10-flowered. Bracts 
lanceolate, acuminate, pilose, as long as the ovary. Flowers yellow- 
Sepals lanceolate, aristate. Petals scarcely longer than the sepals, 
oblong, abruptly cuspidate with much exserted apex. Lip cuneate- 
flabellate, 5-lobed in front ; lobes ligulate, acute ; dise papillose ; sp 
