Wild orchids in sumatra: Pteroceras sumatranum (Schltr.) Seidenf., 1988

First time I will remember Pteroceras compressum when I see the photo specimen below. After read a few references, I follow Schlechter and seidenfaden (1988) put this species as separated species.

Homotypic Synonyms:

Sarcochilus sumatranus Schltr., Bot. Jahrb. Syst. 45(104): 59 (1911).

Pteroceras sumatranum (Schltr.) Seidenf., Opera Bot. 95: 256 (1988).

Pteroceras sumatranum (Schltr.) Seidenf.

I compare and follow the protolog and see the flowers more bigger than P. compressum and the form quite different from many photo`s of P. compressum and P. teres a specially easy to see at their labellum. The different disticnt at lateral have form as ":Oblique, squarish-rectangular with oblique nervation" (Seidenfaden, 1988), and the form appear at our specimen

Basionym

Bot. Jahrb. Syst. xlv. Beibl. 104, 59. 1911

Sarcochilus sumatranus Schltr.

Epiphyticus, dependens vel patulus, usque ad 15 cm longus;

radicibus filiformibus elongatis, flexuosis, glabris;

caule usque ad 10 cm longo, tereti, glabro, omnino vaginis foliorum obtecto;

foliis erecto-patentibus, oblique elliptico-ligulatis, obtusis, basin versus paulo angustatis, 8,5--1 2 cm longis, medio fere 1,4-2,5 cm latis;

racemis elongatis, folia plus minusve excedentibus, usque ad 25 cm longis, multifloris, paulo compressis, illos S. teretis Rchb. f. imitantibus;

pedunculo brevi, bracteis semiorbicularibus abbreviatis. ovario multoties brevioribus;

rhachi paulo incrassata;

floribus succedaneis, distichis, illis D. compressi Rchb. f. similibus sed paulo majoribus;

sepalis obovato-ellipticis obtusis, glabris, c. 1 cm longis, lateralibus

obliquis, apice obtuse acuminatis; petalis oblique obovatis obtusis, 0,8 cm longis;

labello e basi trilobo, lobis lateralibus erectis, falcatis, oblongis, obtusis, c. 0,4 cm longis, intermedio perbrevi, obtusissimo, transverso, in calcar carnosum, circuitu ovato-lanceolatum, obtusum, glabrum, porrectum, ima basi tantum saccato-concavum, 0,6 cm longum producto, lamellis 2 divergentibus carnosis e basi labelli usque ad basin calcaris decurrentibus;

columna brevi apice valde incrassata, pede 0,5 cm longo, attenuato;

anthera cucullata glabra, antice breviter et obtuse rostrata;

polliniis subglobosis, stipite lineari, basin versus paulo angustato, glandula suborbiculari ampla;

ovario cylindrico glabro, c. 0,6 cm longo.

Auf Bäumen bei Padang-Pandjang, ca. 800 m ü. M. (R. SCHLECHTER n. 15965. - Blühend am 28. Jan. 1907)

Mit S. compressus Rchb. f. nahe verwandt aber durch Blütenfärbung und die Form

des Labellums durchaus gut getrennt. Die Blüten sind weiß mit je einem roten Fleck

am Grunde der Sepalen, Petalen und des verdickten Sporns resp. Fortsatzes des Mittellappens der Lipp.

S. teres Rchb. f.

Auf Bäumen bei Padang-Pandjang, ca. 800 m ü. M. (R. SCHLECHTER n. 45 968. - Blühend am 28. Jan. 1907).

On trees at Padang-Pandjang, about 800 m above sea level. M. (R. SCHLECHTER n. 15965 - Flourishing on January 28, 1907)

With S. compressus Rchb. f. closely related but by the shape and flower color the labellum quite well separated. The flowers are white with one red spot at the base of the sepals, petals, and the thickened spur respectively. Extension of the middle lobe of the lip.

S. teres Rchb. f.

On trees at Padang-Pandjang, about 800 m above sea level. M. (R. SCHLECHTER n. 45 968 - Flourishing on January 28, 1907).

Beiblatt zu den Botanischen Jahrbüchern. Nr. 104 : 50-60, 1911

Examination