Aylostera leucacantha was first described (as Lobivia steinmannii var. leucacantha) in Lobivia 85, pp. 145 -146, by Walter Rausch in 1987.

Here is the description in Latin as published, with my own English translation below.

Lobivia steinmannii (Solms‑Laub.) Backbg. var. leucacantha Rausch var. nov.

Simplex vel paulum proliferans, brevicylindrica, 20 mm diametiens, glauca, radice rapiformi; costis 10, rectis, crenis transversalibus parvis in gibberes 2 mm longos divisis; areolis rotundis ad ovalibus, 1.5 mm longis, fusco‑tomentosis; aculeis marginalibus 5 paribus et 1 deorsum directo, ad 6 mm longis, setosis, divaricatis, subarcuatis et inter se contextis, albis; aculeo centrali 0.

Floribus 40 mm longis et diametientibus; ovario et receptaculo viridi, squamis perviridibus, pilis et setis albis tecto; phyllis perigonii exterioribus spathulatis, tenui‑acuminatis, violaceo-roseis, medioviridi‑striatis; phyllis perigonii interioribus spathulate‑rotundis, serratis, tenui‑acuminatis, aurantiacis; fauce 20 mm longa, 7 mm eius connata, albida, filamentis clare‑roseis, stylo et stigmatibus (6) viridibus. Fructu seminibusque Lobiviae steinmannii (Solms‑Laub.) Backbg. modo.

Patria: Bolivia, Cinti australis, supra La Cueva in 3.700 m alt.

Typus: Rausch 644.

English translation

Lobivia steinmannii (Solms‑Laub.) Backbg. var. leucacantha Rausch var. nov.

Simple to branching a little, short cylindrical, 20mm diameter, glaucous, tap-rooted; 10 ribs, straight, with small transverse notches divided into 2mm long tubercles; areoles round to oval, 1.5mm long, brown-woolled; marginal spines 5 equal spreading and one pointing downwards, up to 6mm long, bristly, slightly curved, crossing; no central spines.

Flowers 40mm long and in diameter; ovary and receptacle green, with green scales, covered in white hairs and bristles; outer petals spatulate, thin-pointed, violet-pink with a central green stripe; inner petals round-spatulate, serrated, thin-pointed, orange; throat white, 20mm long, 7mm of which fused, anthers pale pink, style and stigmas green. Fruit and seed as for the type Lobivia steinmannii (Solms-Laub.) Backbg.

Habitat: above La Cueva in Sud Cinti, Bolivia, at 3,700m altitude.

Type: Rausch 644.