• Mammillaria lasiacantha subs. egregia f. cristata hort.
• Mammillaria egregia f. cristata

• Mammillaria lasiacantha Engelm.
• Cactus lasiacanthus (Engelm.) Kuntze
• Chilita lasiacantha (Engelm.) Orcutt
• Ebnerella lasiacantha (Engelm.) Buxb.
• Escobariopsis lasiacantha (Engelm.) Doweld
• Neomammillaria lasiacantha (Engelm.) Britton & Rose
• Mammillaria lasiacantha var. denudata Engelm.
• Cactus lasiacanthus var. denudatus (Engelm.) J.M.Coult.
• Chilita denudata (Engelm.) Orcutt
• Ebnerella denudata (Engelm.) Buxb.
• Mammillaria denudata (Engelm.) A.Berger
• Mammillaria lasiacantha f. denudata (Engelm.) Schelle
• Neomammillaria denudata
• Mammillaria lasiacantha f. wohlschlageri (Repp.) Hoeve
• Escobariopsis lasiacantha subs. wohlschlageri (Repp.) Doweld
• Mammillaria wohlschlageri Repp.
• Mammillaria lengdobleriana Boed.
• Chilita lengdobleriana (Boed.) Buxb.
• Mammillaria neobertrandiana Backeb.
• Mammillaria roemeri Wolfg.Krüger & W.Rischer
• Mammillaria sp. f. cristata SB500 Cuatrocienagas, Coahuila, Mexico
• Mammillaria sp. SB500 Cuatrocienagas, Coahuila, Mexico hort., S.Brack

• Mammillaria lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) D.R.Hunt
• Escobariopsis lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) Doweld
• Mammillaria egregia Backeb. ex Rogoz. & Appenz.
• Mammillaria stella-de-tacubaya subs. egregia (Backeb. ex Rogoz. & Appenz.) Appenz. & Lizen
• Mammillaria stella-de-tacubaya var. egregia (Backeb. ex Rogoz. & Appenz.) Rogoz. & Plein
• Neomammillaria egregia (Backeb.) Y.Itô
• Mammillaria lasiacantha subs. egregia f. cristata hort.
• Mammillaria egregia f. cristata

• Mammillaria lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) D.R.Hunt
• Chilita х magallanii (F.Schmoll ex R.T.Craig) Buxb.
• Ebnerella х magallanii (F.Schmoll ex R.T.Craig) Buxb.
• Escobariopsis lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) Doweld
• Mammillaria lasiacantha f. magallanii (F.Schmoll ex R.T.Craig) W.A.Fitz Maur. & B.Fitz Maur.
• Mammillaria magallanii F.Schmoll ex R.T.Craig
• Neomammillaria х magallanii (F.Schmoll ex R.T.Craig) Y.Itô
• Mammillaria magallani var. hamatispina Backeb.
• Mammillaria roseocentra Boed. & F.Ritter
• Mammillaria magallanii var. roseocentra (Boed. & F.Ritter) Lizen

Description: Mammillaria lasiacantha subs. egregiaSN|17187]]SN|13772]] is a well known tiny geophytic cactus that forms small snow-white ball. The crest form (Mammillaria lasiacantha subs. egregia f. cristataSN|13772]]SN|17187]]) - despite to its beauty - is still very rare and sought after by collectors, for its unique features.
Habit: It is a small low growing crested cactus that will slowly forms white tangled groups up to 10 cm in diameter. The plant grows deep-seated in substrate and is inconspicuous, but it cultivation it is almost always seen grafted on columnar cacti.
Stem: Fan-shaped, grey-green, up to 5 cm in width (but usually less).
Tubercles: Cylindrical, without latex, axils bare.
Roots: Diffuse, not enlarged.
Spines: 50 or more per areole, in several series but all equally thin, mostly appressed, white, innocuous, bristle-like, 0,5-6 mm, glabrous, all interpreted as radial, innermost spines shortest.
Central: Absent.
Flowers: Approx 1 cm long and in diameter; dirty greenish-white or cream, usually with sharply defined midstripes of reddish-brown.
Blooming season (In Europe): January to March
Fruits: Scarlet, cylindrical or clavate, 10-25 mm long, with floral remnant persistent, ripening in June-August.
Seed: Black.

Bibliography: Major references and further lectures.
1) Robert T. Craig “The Mammillaria handbook: with descriptions, illustrations, and key to the species of the genus Mammillaria of the Cactaceae” E P Publishing, 1945
2) John Pilbeam “Mammillaria The Cactus File Handbook” Cirio Pub. Services, 01/Dec/1999
3) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
4) 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
5) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
6) N. L. Britton, J. N. Rose “The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family.” Volume 4, The Carnegie Institution of Washington, Washington 1923

Cultivation and Propagation: It regarded as a choice and difficult plant and grows quite slowly. It is usually seen as a grafted plant but grows on its own roots too.
Soil: Use mineral well permeable mineral soil with little organic matter (peat, humus).
Exposure: They need a good amount of light shade to full sun this help to keep the plants healthy, although slow growth.
Watering: Water sparingly from March till October (weekly during summertime, if the weather is sunny enough) , with a little fertilizer added. Less or no water during cold winter months, or when night temperatures remain below 10° to prevent root loss. It is very sensitive to overwatering (rot prone).
Fertilization: Feeding may not be necessary at all if the compost is fresh then, feed in summer only if the plant hasn't been repotted recently. Do not feed the plants from September onwards as this can cause lush growth which can be fatal during the darker cold months.
Hardiness: Keep perfectly dry in winter at temperatures from 5 to 15 degrees centigrade. (but it is relatively cold resistant and hardy to -5° C, or possibly colder for short periods) In the rest period no high atmospheric humidity!! (Temperature Zone: USDA 9-11)
Crested growth: Unlike 'monstrose' varieties of plants, where the variation from normal growth is due to genetic mutation, crested growth can occur on normal plants. Sometimes it's due to variances in light intensity, or damage, but generally the causes are unknown. A crested plant may have some areas growing normally, and a cresting plant that looks like a brain, may revert to normal growth for no apparent reason. If you have any of the crested part left you need to remove the normal growth and leave the crested part behind this will need to be done regularly.
Propagation: Grafting or cuttings. Plants are usually grafted onto column-shaped cacti but proved to be able to produce their own roots if degrafted. Cuttings will take root in a minimum temperature of 20° C (but better in hot weather). Cuttings of healthy shoots can be taken in the spring and summer. Cut the stem with a sharp, sterile knife, leave the cutting in a warm, dry place for a week or weeks (depending on how thick the cutting is) until a callus forms over the wound. Once the callus forms, the cutting may be inserted in a container filled with firmed cactus potting mix topped with a surface layer of coarse grit. They should be placed in the coarse grit only; this prevents the cut end from becoming too wet and allows the roots to penetrate the rich compost underneath. The cuttings should root in 2 to 6 weeks. Large crested piece must be placed on the soil surface without burying the plant base down in the soil.