Rebutia fuviseta WR 319 Tarija, Tarija, Bolivia.
This is a great favourite among the small clustering rebutias. It has dark reddish bodies with dense soft tawny-red spines.
 

Description: Single or clustering (mat forming) cactus. Probably a very decorative variety of Rebutia deminuta. Maximum dimension 6 cm tall 10 cm wide.
Stem: Globular or vaguely elonged 1 cm in diameter 1,5 cm tall () The epidermis is very dark tan green or brown, almost black with the a reddish-violet nuance.
Ribs: Up to 16 tuberculate and spiralling.
Areoles: Round or oval, with a brown indumentum.
Spines: 10-12 radials and 1-3 centrals about 6-10 mm long, Thin divergent tawny or brownish-reddish with a darker tips, that impart to the plant a characteristic bristled up form.
Flowers: Funnel-shaped thin petaled (spidery) dark red, 2,5cm in diameter and long arising from the base of the stem with a long stretched out pistil and showy white stamens.
Blooming time: Diurnal in spring.
Fruit: Spherical dark red up to 4 mm.

Cultivation: Need a very bright exposure but not direct sun.  Water regularly in summer but do not overwater. Keep dry in winter Hardy to -4°C.
It is better that they are repotted regularly. Repotting will increase the number and size of stems and will increase the number of flowers produced. Repot yearly until reaching about 40-50mm in size, then every two or three years will suffice. Repotting is best done at the end of winter but can be done at other times. Do not water for a couple of weeks after repotting to reduce risk of root rot via broken roots

Propagation: Offsets, seeds

Scientific name:  Rebutia fulviseta Rausch,
In: Kakt.u.a.Sukk. 21(2):29 (1970);

Subgenus: Aylostera Section: Aylostera.

Origin:  Bolivia, Tarija, Arque, near Padcaya, 2200 m; Argentina, Salta, Santa Victoria to Caspala, to Santa Ana, to the east from Humahuaca.

Conservation status: Listed in CITES appendix 2.

• Aylostera fulviseta Rausch

The flowers are diurnal, dark red with thin petals (spidery) and many showy white stamens.