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Mammillaria microthele
(Syn: Mammillaria formosa)

CACTUSPEDIA       

 


Mammillaria microthele ( v. superfina ) SB34 Presa de Guadalupe, San Luis Potosi, Mexico
This is a relatively tough and user-friendly small cactus with tight, dense minute
white spines that lie flat against the plant so not that dangerous.
 

Etymology: Microthele from Greek “micros”=small and Geek “thele”= tubercle, for the very small tubercles of the plant.

Description: Slow-growing flattened plants, clumping with tight, short white spines, form low mounds in time
Stems: Almost discoidal to globose, apically depressed, dividing dichotomously, each stem are up to 6 cm in diameter.
Radial spines: 22 - 24 tiny, white and bristle-like that almost obscure the stem.
Flowers: Rings of small (5 mm) nearly pure white (Or with light pink midstipe ) are produced in spring over a several weeks period
Remarks: The so called M. microthele “superfina” is a particular nice selected form with very small tubercles and spines.

Recognized subspecies, varieties and forms:

  • Mammillaria formosa subsp. formosa: It has 20-22 radial spines and pink flowers. Origin: oahuila, Aguascalientes, Guanajuato, Zacatecas, Tamaulipas, Nuevo Leon and San Luis Potosi.

  • Mammillaria formosa  subsp. microthele: It has 22-24 bristly, flattened spines with white flowers. Origin: Cohahuila, Guanajuato, Tamaulipas and San Luis Potosi. This form should be grown conservatively to preserve the flat habit that is present in the wild.

  • Mammillaria formosa subsp. pseudocrucigera: It has about 18 radial spines, (sometime lacking in mature areoles) the blooms are pink with paler margins. Origin: Queretaro, Guanajuato.
     

 

Photo and © copyright by Mladen Turcinovic (Croatia)

Photo and © copyright by Mladen Turcinovic (Croatia)
 
Family: Cactaceae (Cactus Family)


Scientific name:  Mammillaria microthele Muehlenpfordt
Published in: Allg. Gartenz. 16:11 (1848) First description

Nowadays regarded as: Mammillaria formosa ssp. microthele (Muehlenpfordt) D.R. Hunt

Origin:  Origin: Mexico (Coahuila, San Luis Potosi, Tamaulipas).

Habitat:  usually found in limestone slopes of Agave lecheguilla-Hechtia glomerata scrub. Altitude 1.000 - 2.200 m.

Conservation status: Listed in CITES appendix 2.

Synonyms:

  • Mammillaria formosa Galeotti ex Scheidweiler
    1838
  • Mammillaria pseudocrucigera
  • Mammillaria arroyensis

 

Notes: This is one of the Mammillaria commonly called "Owl Eye Cactus", known for dichotomous branching (forking or dividing into two parts). Although dichotomous branching is not a common occurrence in cacti in general, it happens for some reason in this particular subspecies.  What is interesting about this cactus is that it began as a single head, and it has now divided twice, forming what will be four separate branches. When the division process started, it was obvious that four heads would appear, but I don’t think the one head divided quadruply. Most probably, one head became two, and then those two immediately divided.  Other Owl Eye Cactus among others comprise:
 M. karwnskiana, M. formosa,  M. tlalocii and M. perbella.


Photo and © copyright by Mladen Turcinovic (Croatia)
Old plants with lots of branching are treasures.
 

 


Cultivation:
It is a  slow growing  species .  Use pot with good drainage and a very porous mineral-based potting mix,  keep dry in winter. Pot plants are quite wet-sensitively. Care must be taken with watering (Rot prone) and needs good drainage. Water sparingly during the growing season, keep very dry in winter.
 Feed with a high potassium fertilizer  in summer.
Usually it is recommended to overwinter this plant in a bright and warm greenhouse with at least 8-10° C , but it proved to be quite frost resistant
(if kept dry it hardy as low as -10° C)Outside full sun or afternoon shade, inside needs bright light, and some direct sun.
Propagation: Direct  sow after last frost, cuttings (if available).



Photo and © copyright by Mladen Turcinovic (Croatia)

Photo of conspecific taxa, varieties, forms and cultivars of  plants belonging to the Mammillaria formosa complex (This Taxon has lots of synonyms ( like many other cacti) whit several controversial varieties and subspecies and comprises a multitude of different forms, but where each form is linked to others by populations of plants with intermediate characteristics):

Photo gallery: Alphabetical listing of Cactus and Succulent pictures published in this site.

Photo gallery MAMMILLARIA



 

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This old page has been moved! Click the link next on the right to enter the new Enciclopedia of Cacti. We hope you find this new site informative and useful.

The Encyclopedia of Cacti