Description
Turbinicarpus schmiedickeanus is a solitary or slowly clumping tiny cactus species that grows almost completely buried in the ground.
Forma aurea or aurata (yellow form): The schizochromic form (Turbinicarpus schmiedickeanus f. aurata) has pale yellow stems due to the absence (or reduced production) of chlorophyll pigments: every other pigment is present at normal levels, the dominant green colouration is lost, but will still more than likely have normal other pigments that give the yellow overall appearance of the stem. This form with yellow stems is very attractive and highly prized. This schizochromic form is almost always seen grafted on stronger columnar species, and cannot can be grown on its own roots. However some clones have enough chlorophyll in their tissues and can be grown on they own roots too, but very slow growing.
Stems: Globular more or less depressed, 30-50 mm high, 35-40 mm wide, yellow, apex with some white wool.
Ribs: completely divided into tubercles that are more or less well-rounded to square to almost short ,conical, 5 mm broad at the base, up to 7 mm long and pointing upwards, arranged in flat spirals.
Root: Taproot.
Areoles: On the tip of the tubercle, with a little wool, soon becoming bare.
Spines: 3 (more rarely 4) the lower one longer, up to 2,5 cm, the 2 side spines approximately 1/3 as short and the upper, very often missing, still shorter, flattened below, curved towards the apex and often contorted, grey, corky, rather soft, with transverse fissures. The spines are persistent only on the upper body; below they fall off, and the body and tubercles are corky and bare.
Flowers: Apical funnel shaped, whitish to pinkish, outside with darker midribs 14-25 mm wide. This plant is capable of blooming when it is little larger than 1 cm Ø.
Origin and Habitat
Garden origin (Nursery produced cultivar)
Cultivation and Propagation
Variegated and albinos cacti are regarded as choice and difficult in cultivation, but despite that many of them are relatively easy to grow. But be aware that they cannot tolerate prolonged exposure to direct sun light (especially during the hottest summer days), so grow them in half-shade or under filtered sun. They are sometime seen as grafted plants, but many grow well on their own roots, too.
On the contrary, the albinos can survive only if grafted on a strong green base.
Use mineral well-permeable substratum with little organic matter (peat, humus). Water sparingly from March till October and keep perfectly dry in winter at temperatures from 5 to 15 degrees centigrade. (In general these plants are more tender and cannot endure freezing temperatures ) In the rest period no high atmospheric humidity!!
Propagation: Usually by seed. Plants are often grafted onto column-shaped cacti.
Bibliography
Major references and further lectures
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Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
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James Cullen, Sabina G. Knees, H. Suzanne Cubey “The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass” Cambridge University Press, 11/Aug/2011
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David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. “The New Cactus Lexicon” dh books, 2006
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Davide Donati, Carlo Zanovello “Conoscere, capire, coltivare i Turbinicarpus-Rapicactus” Cactus Trentino Sudtirol, 2004
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Fitz Maurice, B, Fitz Maurice, W.A., Sotomayor, M. & Smith, M. 2013. Turbinicarpus schmiedickeanus. In: IUCN 2013. “IUCN Red List of Threatened Species.” Version 2013.2. <www.iucnredlist.org>. Downloaded on 25 February 2014.
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