Index:



L. hermetica
    acf 'Green Diamond'



Lithops hermetica D.T. Cole (2000)



 

Origin:


Collected on 6 and 7 July 1995 by Steven Hammer (Hammer 2003) and Dr & Mrs Graham Williamson (G&FW & H 5444 (NBG)), as members of a botanical expedition into the Protected Diamond Area (Sperrgebiet), Namibia. Collected and studied in habitat also by Desmond T. and Naureen A. Cole on 12 May 1999.
Type: C397 (WIND, holo, iso); Namibia -2716AA, in calcrete and dolomite. The very appropriate specific name, hermetica, was proposed by Steven Hammer in reference to the 'hermetically sealed' Protected Diamond Area, the only area where Lithops and other succulent plants are reasonably safe from predators.

Distribution:


Namibia, in a series of colonies (or a single disjunct colony), along the southern edge of the Tsaus Plateau at its southwestern end; the plants probably occur also further to the north and east on the plateau.
Stone: Weathered and mostly very rough dark blue-grey dolomite rocks, with mostly white to greyish white calcrete stones, chips and rubble, also very weathered and coarse, in the channels between the dolomite rocks.

Description:


A small and variable species, with distinctive pale or whitish grey islands contrasting with dark grey windows, sometimes with greenish or faintly reddish tints.
Profile Mainly ± truncate, occasionally cordate-truncate, flat to slightly convex; fissure deep, up to 8 mm; lobes slightly divergent.
Face flush to slightly elevated; mostly elliptic; lobes mostly ± unequal; opaque to partly transluscent; slightly rugose.
Margins very irregular, usually deeply incised by intrusive channels; inner margins rather more regular, sometimes incised or broken.
Windows manifest as broad to narrow irregularly shaped channels, slightly impressed, usually fairly broad, up to 3 mm wide, occasionally almost open.
Channels broad to narrow, irregular, occasionally reduced to a number of slightly impressed irregular grooves and mini-windows, forming a very irregular fine lacework; sometimes further reduced to a number of unconnected narrow grooves or isolated mini-windows in an opaque face.
Islands occur as relatively large, irregularly-shaped opaque areas enclosed by channels.
Rubrications absent.
Dusky dots numerous, greenish grey, scattered irregularly over the whole face, opaque and transluscent areas alike, often concentrated alongside and especially in the channels, when it becomes difficult even with a lens to distinguish between channels and concentrations of dusky dots.
Colours: Face (margins and islands) opaque pale grey. Channels obscurely transluscent dark grey to greenish grey, sometimes with a reddish tint. Shoulders as for the face or very slightly paler.
Size: Small, facial diameters up to 23 X 16 mm, mostly about 18-12 mm. Number of heads up to 5 or more, mostly 2.

Flowers:


Yellow, small, rarely up to 27 mm Ø, mostly 18-23 mm Ø
Seed capsules mostly 5-merous (95%), rarely 6-merous (5%). Profile boat-shaped, slightly convex. Face broadly elliptic.
Seeds very light creamy yellow, with a light brown tip; smooth (This colour is so distinctive that it does not fit into our usual descriptive scheme).

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Lithops hermetica D.T. Cole (2000)


acf 'Green Diamond'



Origin:


This form has appeared among seedlings grown from seeds on plants collected in colony C397. No specimens of this form were found in habitat, but presumably they have occured there naturally at some time.

Description:


Distinctive in colour, but in all other respects the same as other plants of this species.
Colours: Margins, islands and shoulders opaque creamy greyed green. Windows and channels transluscent greyish green or greenish grey.

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* Information from CACTUS & Co, Vol. X, 1, pp 57-59 (2006)


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