A recent discovery, Rebutia (Aylostera) fischeriana was described in Kaktusy XXXVIII: 3, pp. 66-70, by Rudolf Slaba in 2002. I have been unable to obtain a copy, but a colleague has very kindly provided an English summary translation. I believe the original is written in Czech. The plant resembles Aylostera gonjianii at first glance, but flowers, fruit and body shape are different.
Rebutia fischeriana Slaba 2002
Stem solitary, later branching to clumping, shortly cylindrical, about 30 mm long and 15 mm wide. Tap rooted. The skin is dull, grayish dark green to slightly reddish; 9-11 ribs, max. 4 mm wide, divided by transverse incisions in a tubercle about 3×3 cm. 11-13 spines, pressed against the stem, pectinate, about 2 mm long, whitish with pink base. Flower extremely broadly funnel-shaped, about 25 mm wide and 30 mm long. Inner petals orange, up to 7 mm wide. Flower trumpet extremely short, whitish woolly on the outside, style, stigmas and anthers light yellow, filaments burgundy red. Fruit spherical, up to 10 mm wide, whitishly woolly. The seed is about 1.1 mm long and 1.0 mm wide, the testa dull and brownish, covered with remnants of grey-brown sheaths, cells indistinctly lined, hilum with indistinct rim.
TYPE LOCATION: Argentina, Jujuy province, on the way from Purma Marco to San Antonio de Los Cobres, about 5 km uphill from Purma Marco to the Abre de Pives pass, 4050 m above sea level.
HOLOTYPE: LF 54, is stored in the herbarium PR (Průhonice) under No. 4704.