Index:



L. olivacea var. olivacea
L. olivacea var. nebrownii
    acf 'Red Olive'



Lithops olivacea (N.E. Brown) L. Bol. (1929)


var. olivacea



   

Origin:


Collected by Ernest Russel Fuller in 1928 (NBG 1725/28). Latin olivacea 'olive-green'.

Distribution:


RSA: CP, in a small area extending W and SW from Pofadder to the vicinity of Aggeneys. TL 'District Kenhardt, near Kakamas'. Our extensive researches so far have failed to locate L. olivacea or any evidence of it anywhere in the vicinity of Kakamas, which is some 120 km ENE of Pofadder; the latter is, however, included in the Kenhardt District.
Stone: Transluscent white and red-stained quartzite, some grey, brown.

Description:


A distinctive species, mostly rather round in facial shape and with windows usually clearly demarcated and open; uniform and relatively easy to identify.
Profile truncate; top surface flat to slightly convex, occasionally slightly concave; fissure fairly deep, 6-12 mm; lobes conjunct, usually very slightly divergent at the top.
Face flush; mostly ± round, sometimes slightly elliptic; lobes equal-unequal; opaque + transluscent; smooth.
Margins very distinct, broad to narrow, regular to slightly dentate, occasionally with small peninsulas.
Windows mostly completely open, otherwise usually with few islands.
Channels usually absent, manifest only as mostly wide transluscent areas between islands.
Islands usually few and relatively small, usually distinct but sometimes reduced to obscure flecks.
Rubrications absent.
Dusky dots not visible.
Colours: Margins and islands various shades of opaque creamy grey, often tinged with yellow, green, pink, buff, pale salmon or mauve. Windows and channels various shades of transluscent green or bluish, greyish, brownish or orange-green, or greenish or mauvish grey. Shoulders as for the margins, but usually greyer and duller.
Size: Small to medium, facial diameters up to 24 X 18 mm, mostly about 18 X 15 mm. Number of heads up to 30 or more, mostly 3-10.

Flowers:


Yellow with white centres, medium to large, up to 45 mm Ø, mostly 25-35 mm Ø.
Seed capsules mostly 5-merous (95%), otherwise mainly 6-merous (3%), or 4-merous (2%). Profile boat-shaped, top ± flat. Face broadly elliptic to elliptic, up to 9 X 7,5 mm, mostly about 7,5 X 6,5 mm; cell-lids slightly concave, the edges therefore very distinct and raised.
Seeds yellow-brown; rugose 1, flecked.

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Lithops olivacea (N.E. Brown) L. Bol. (1929)


var. nebrownii D.T. Cole (1988)



 

Origin:


Collected by D.T. & N.A. Cole on 5 July 1969 (C162B, PRE). Named for Nicholas Edward Brown, ardent student of succulent and other plants, in particular the Mesembryanthemaceae (now included within the Aizoaceae), to the taxonomy of which he made enormous pioneering contributions; author, inter alia, of the genus Lithops and of several species of this genus.

Distribution:


RSA: CP, in a small area to the SW of Aggeneys and near Aggeneys, thus at the SW end of the range of the species. TL SW of Aggeneys (C162B), growing socially with L. julii subsp. fulleri (C162A).
Stone: Transluscent white and red-stained quartzite; opaque white quartzite stained with pink & red, rose quartz, feldspar flecked with mica.

Description:


Distinguished from the type by its colour, slightly cordate profile and usually divergent fissures.
Profile truncate-cordate; top surface distinctly convex, sometimes slightly humped, occasionally with one side of the face slightly lower than the other and therefore slightly lopsided; fissure deep, 7-18 mm; lobes usually somewhat divergent.
Face slightly elevated; mostly elongated elliptic; lobes equal-unequal; opaque + transluscent; smooth.
Margins very distinct, narrow, regular to slightly dentate, occasionally with small peninsulas.
Windows usually completely open, sometimes partly occluded; the ends of the inner margins sometimes drawn to fine points extending downwards along the sides of the fissures.
Channels usually absent, manifest only as transluscent areas between islands.
Islands usually small, few to fairly numerous, irregular, mostly distinct but sometimes reduced to obscure flecks.
Rubrications absent.
Dusky dots not visible.
Colours: Margins and islands various shades of opaque yellowish or pinkish beige, salmon, yellowish grey or pale apricot. Windows and channels various shades of transluscent greenish brown, greyish pink or brownish green, usually with a distinctly deeper-hued (orange-brown) line along the inner margin and often also as a lining along the outer margins. Shoulders as for the margins or greyer and duller.
Size: Small to medium, facial diameters up to 30 X 20 mm, mostly about 23 X 15 mm. Number of heads up to 13 or more, mostly 2-6.

Flowers:


Yellow with white centres, medium, up to 35 mm Ø, mostly 25-30 mm Ø.
Seed capsules mostly 5-merous (88%), otherwise 6-merous (9%), or 7-merous (3%). Profile boat-shaped, top ± flat. Face broadly elliptic to elliptic, up to 9 X 7,5 mm, mostly about 7,5 X 6,5 mm; cell-lids often with dark spots (taniniferous idioblasts) in the centre, and slightly concave, their edges therefore very distinct and raised.
Seeds yellow-brown; rugose 1, flecked.

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Lithops olivacea (N.E. Brown) N.E. Br. (1912)


var. nebrownii
acf 'Red Olive' (1999)



Description:


Derived from seed collected by M. Bruce Bayer near Aggeneys, CP. Differs from the type in being distinctly red in colour.

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* Information from COLE, DESMOND T. and NAUREEN A., (2005) Lithops Flowering Stones, Cactus&Co. Libri


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