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Robiquetia species, or something else?

Discussion in 'Orchid Identification Section' started by tropicbreeze, Sep 30, 2018.

  1. tropicbreeze

    tropicbreeze New Member

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    I thought this was Robiquetia gracilistipes but the few photos I've found on the net look different. This one hasn't produced long stems either. The strap-like leaves are about 120mm long, 30mm at the widest, only 4 to 5 leaves at a time. Flowers are about 8mm across. Also checked out Saccolabiopsis but nothing there seems to match.
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  2. Ray

    Ray Orchid Iconoclast Supporting Member

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    A gastrochilus, perhaps?
     
  3. carl

    carl Active Member

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    Looks like that to me, too.
     
  4. tropicbreeze

    tropicbreeze New Member

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    Thanks for the suggestions. I checked Gastrochilus but never came up with any species that matched. But an interesting find - the structure of the column in Gastrochilus flabelliformis was incredibly similar to my mystery orchid. I combined close ups of both (Gasterochilus on the left).
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    Only problem is that the general structure of Gastrochilus flowers differs from mine. The labellum in mine is developed into a "pitcher", which is a characteristic of Robiquetia (commonly called "pitcher orchids". The labellum in Gasterochilus is developed into more of a cup (or not even a "cup" in some species). I think I need a taxonomist.
     
  5. KellyW

    KellyW Orchid wonk Staff Member Supporting Member

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    Perhaps a Cleisostoma?
     
  6. tropicbreeze

    tropicbreeze New Member

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    Thanks Kelly, I went through images of all the Cleisostoma I could find and still drew a blank. So I ended up using an interactive key on the internet and reduced the candidate species to four. Happily one of them turned out to be my mystery orchid - Pomatocalpa macphersonii, Blotched Bladder Orchid. Not a Pitcher" orchid but a "Bladder" orchid.

    Description
    Epiphytic or lithophytic herb forming small clumps. Plants usually consisting of single growth with thick cord-like roots. Stem semi-pendulous to pendulous, 5-10 cm long, flattened. Leaves 2-8, crowded along stem, widely spreading, prostrate to pendulous, distichous, alternate, sessile, bases sheathing stem and imbricate; lamina oblong, 15-25 cm x 3-3.5 cm, dark green, thin-textured but stiff, main vein ridged beneath, apex deeply unequally emarginate. Inflorescence an axillary raceme, decurved, 15-40 mm long, stiff; pedicels 3-5 mm long. Flowers 3-30, resupinate, porrect to nodding, cupped, not spreading widely, 7-10 mm x 7-10 mm, yellow with red blotches. Sepals and petals incurved. Dorsal sepal oblong to obovate, 3-5 mm x 2.5-3 mm. Lateral sepals free, oblong to obovate, falcate, 3-5 mm x 2.5-3 mm, divergent. Petals 3.5-4.5 mm x 2-2.5 mm. Labellum 3-4 mm x 4-5 mm, white with red blotches, 3-lobed; lateral lobes 0.5 mm x 2 mm, flat, erect; midlobe decurved, fleshy; spur 2 mm long, obtuse, apex enlarged. Column 3 mm long, thicker at the base. Column foot absent. Capsules porrect, dehiscent.

    Ecology
    Occurs in rainforests, especially in lowland rainforests, growing on trees and often seen projecting at right-angles from tree trunks and larger branches.

    Flowering period: July-October (southern hemisphere).
     
    Marni likes this.
  7. Ray

    Ray Orchid Iconoclast Supporting Member

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    Acampe?
     
  8. tropicbreeze

    tropicbreeze New Member

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    Thanks for the input Ray. I did check Acampe but none of them have a 'bladder' type of labellum although some of the colour patterns are similar. It's definitely Pomatocalpa macphersonii.

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