Origin and Habitat: Mexico, Coahuila, Sierra de la Paila.
Altitude range: 1600-2200 metres above sea level.
Type locality: Mexico, Coahuila, 48 km N of El Marte, 2000-2200 metres, a railway station on the railroad parallel to route 40, the Saltillo-Torreon road.
Habitat and ecology: Coryphantha pseudoechinusSN|10393]]SN|10393]] subsp. laui grows on hilltops with limestone gravel and rocks.

• Coryphantha pseudoechinus subs. laui (L.Bremer) Dicht & A.Lüthy
• Coryphantha laui L.Bremer

• Coryphantha pseudoechinus Boed.
• Coryphantha pusilliflora L.Bremer

• Coryphantha pseudoechinus subs. laui (L.Bremer) Dicht & A.Lüthy
• Coryphantha laui L.Bremer
• Coryphantha magentae

Description: Coryphantha pseudoechinusSN|10157]]SN|10393]] subsp. laui (Bremer) Dicht & A. Liithy is very similar to the standard Coryphantha echinusSN|10393]]SN|10157]], with the exception of yellow flowers and slightly different skin and spination colour.
Stem: Solitary or group-forming, globose to ovoid, apex slightly depressed, white woolly, 5.5 cm across and up to 5 cm tall, grass-green.
Tubercles: Conical, somewhat flattened on the upper side, up to 13 mm long, with narrow groove on upper surface, sometimes with yellowish glands near the areoles. Axils woolly in youth.
Areoles: Round, 2 mm diameter at fist woolly soon naked.
Radial spines: 18-20, needle-like, often bristly, flexible, 10-14 mm long, yellowish-horn-coloured.
*Central spine: 0-1, straight, stright or slightly curved downwards, thick, 14-16 mm long, reddish-brown to dark mahogany, becoming grey.
Flowers: funnelform,Pale yellow, 3.5 cm long, 3 cm diameter. Outer perianth segments linear lanceolate, light yellow with green near the tip, and reddish-brown dorsal midstripe.Onner perianth segments linear lanceolate, light yellow. Flaments glassy white, anthers light orange. Style pale green with 5-7 cream-white stigma lobes.
*Fruit (berries): Egg-shaped, up to 18 mm long and 8 mm wide, jade-green, succulent, with attached flower remnants.
Seeds: 1 x 1.2 mm, brownish, reniform, smooth, shiny, reticulate.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) 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
3) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006

Cultivation and Propagation: In cultivation it is quite sensitive to over-watering (rot prone), and needs good drainage. Keep drier in winter. Like other species from the USA. it blooms quite early, but needs about 8-10 years to reach the typical, definite outlook. It needs full sun; and is hardy to -16° C or less for short periods of time
Propagation: Offsets (seldom available) or by seeds.