Inviato: Mer 17 Lug 2013, 21:03 Oggetto: Mammillaria longimamma
maurillio Mer 17 Lug 2013, 21:03
La descrzione originale da Britton e Rose....
12. DOLICHOTHELE (Schumann) gen. nov.
Plant-body globose, more or less cespitose, soft in texture, never milky; tubercles elongated, not grooved above; flowers borne in axils of old tubercles, very large, with a definite funnel-shaped tube;
inner perianth-segments yellow, spatulate, tapering into a claw and borne on top of tube; stamens forming a spiral about style and borne on whole face of throat, but forming a definite ring at top of
throat; style slender; stigma-lobes linear; ovary exserted, naked; fruit smooth, greenish, purplish, or red, globose, ellipsoid or short-oblong; seeds black or brownish.
Type species: Mammillaria longimamma De Candolle.
The generic name is from δολιχός long, and θηλή nipple, referring to the elongated tubercles.
The fruit is not often collected and is not well known. Dr. Rose obtained a single fruit of one of the species, the only one we had then seen, in a private collection in Rome in 1915; this is nearly globular, red, thin-walled, many-seeded; the seeds are brownish, pitted, slightly flattened, pointed at base, with a small sub-basal hilum. In October 1921, Robert Runyon sent us a number of fruits which were greenish white to purplish, with black seeds, these somewhat flattened and pitted.
Mammillaria camptotricha Dams (Gartenwelt 10: 14. 1905) is usually considered as a close relative of this group, but it differs widely from it in the flowers as well as in other ways, and we believe that it is not congeneric with it (see page 126).
Three species, natives of southern Texas and northern and central Mexico, arerecognized.
Key to Species.
Spines glabrous, even when very young; species of Texas and northern Mexico. . . . . . . . . . . 1. D. sphaerica
Spines puberulent; species of central Mexico.
Tubercles very long (sometimes cm. long), pale green, glaucous; radials 6 or more; central spines usually present .longimamma
Tubercles much shorter, bright green; radial spines 4 or 5; central spines none.
Mammillaria longimamma WTH 851 WTH 851 - Between rocks at the end of the Barranca de Toliman (mining area) - Hidalgo - Mexico
Fotografia in habitat di Wolter ten Hoeve - Assen - Olanda
Mammillaria longimamma WTH 851 WTH 851 - Between rocks at the end of the Barranca de Toliman (mining area) - Hidalgo - Mexico
Fotografia in habitat di Wolter ten Hoeve - Assen - Olanda
L'ultima modifica di maurillio il Gio 23 Ott 2014, 17:23, modificato 2 volte
Mammillaria longimamma WTH 855 WTH 855 - Near the canyon floor of the Rio Moctezuma, between bushes - Queretaro - Mexico
Fotografia in habitat di Wolter ten Hoeve - Assen - Olanda
Mammillaria longimamma WTH 855 WTH 855 - Near the canyon floor of the Rio Moctezuma, between bushes - Queretaro - Mexico
Fotografia in habitat di Wolter ten Hoeve - Assen - Olanda
Di seguito quanto riporta Thomas Linzen nel suo recente "Die Vielfalt Der Gattung Mammillaria a proposito di Mammillaria longimamma...
"Mammillaria loongimamma è una specie caratterizzata dai lunghi tubercoli, ma anche dai fiori grandi e meravigliosamente gialli.
E' la specie principale del sottogenere Dolichothele al cui interno M. sphaerica e M. paulii sono a lei le più vicine.
La gamma di variazione delle dimensioni del tubercolo, della disposizione e del numero delle spine e delle dimensioni e del colore dei fiori ha portato alla descrizione di ulteriori varietà."
Ho trovato queste due belle fotografie in habitat dai "diari di viaggio" di Gregory F. Matuszewski - 2010
Mammillaria longimamma El Arbolito - Queretaro Fotografia in habitat di Gregory F. Matuszewski
Mammillaria longimamma El Arbolito - Queretaro Fotografia in habitat di Gregory F. Matuszewski
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