The original description of Rebutia (Aylostera) rutiliflora was published in Kakteen und andere Sukkulenten 28(4): 76, 1977, the journal of the Deutsche Kakteen-Gesellschaft, by Friedrich Ritter.

Here is the text, but you should look up the original description for more details.

Rebutia rutiliflora Ritter spec. nov.
Ab Rebutia orurensis recedit corpore in sole non rubrescente; costis 8-10, 2 mm altis, tuberculis 3 mm diam., areolis
1 mm longis, lana alba copiosa instructis, 1-2 mm inter se remotis; spinis basi obscure brunneis; tubo florali inferne
viridi ; filamentis inferne viridibus, superne flaveolis; insertionibus solum in parte inferiore et in ora tubi ; petalis rutilis (colore 4 ad 5), petalis mediis obscure purpureis in apice; habitat Mal Paso, Prov. Sud-Chichas, Bolivia.
Collected as FR 1113.