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Cactus and Succulent Journal Vol. XLIII (4): 139-142, 1971

FRAILEA MATOANA Buining & Brederoo Sp. Nov.
A. F. H. BUINING
Fig. 1
Fig. 1. Frailea matoana Buining & Brederoo sp. nov. (photo Buining).
Frailea matoana Buining et Brederoo sp. nov.

     Corpus solitarium, applanate rotundum, rubrum ad obscure brunneum, radicibus ramosis. Costae ad 15, defluentes ad perpendiculum, 4-5 mm. latae, sulcis transversis in tubercula globosa fere quadrata solutae. Areolae ex longo rotundae, tomento griseo-albescente, fere 2 mm. distantes. Spinae radiantes, plus minusve pectinate positae, utrimque 4, infra 1-2, supra saepe 1-2 minores, ad 4 mm. longae, in corpus curvatae, nitidae, obscure-rubiginosae; raro 1 spina centralis brevior rectaque. Flores infundibuliformes, 21 nun. longi, 20 mm. lati, flavi. Peri-carpellum 6 mm. longum, 5 mm. latum, nudum dimidia parte inferiore, ceterum saetis fulvis albipilosumque. Receptaculum 5-6 mm. longum, saetis fulvis albipilosumque. Folia perianthii exteriora spathulata, acuta, margine subtiliter dentata, flava, apice rosea; interiora spathulata acuta, flava. Stylus 12 mm. longus, albo-flavus. Stigmata 8, 3 mm. longa, alba. Stamina pri-maria 7 mm. longa, circum stylum inserta, flava; secundaria 6 mm. longa, parietalia, flava. Antherae ad 0.8 mm. longae, flavae. Camera nectarea 0.4 mm. lata, aperta. Caverna semini-fera 4.5 mm. longa, 3.5 mm. lata. Fructus paulo applanate rotundus, 6-7 mm. diam., saetis brunneis albipilosusque. Semen lintriforme, 2, 1-2, 2 mm. longum, 1.8 mm. latum spadiceum, nitidum, lineamentis reticulatis; hilum oblonge-rotundum tenui texto opertum. Habitat in lateribus medidianis Serra de Maracaju altitudine 270-300 m. Mato Grosso, Brasilia.
Plant depressed globose, simple, to 25 mm. diam., to 11 mm. high, red to dark brown, roots branched.
Ribs to 15, vertical, divided by transverse small furrows into nearly square, globular, small tubercles, 4-5 mm. wide.
Areoles oval, 1.5-2 mm. long, 1 mm. wide, with grayish-white felt contrasting strongly with the dark body, about 2 mm. apart.
Spines radiating, more or less pectinate, 4 on each side, 1 or 2 downwards, often 1-2 smaller upper ones, to 4 mm. long, recurving towards the plant; occasionally 1 shorter straight cen­tral spine; all glossy rubiginous brown.
Fig. 2A
Fig. 2A1
Fig. 2A2
Fig. 2. A: cross-section of the flower; A1: bristles, hair and very short podarium on the wall of the receptacle; A2: bundle of 2 (to 3) ovules.
 
Flower funnel-shaped, 21 mm. long, 20 mm. wide, yellow.
Pericarp 6 mm. long, 5 mm. wide, lower half partly naked, upper portion covered with are-oles, with white hairs and 2-3 bright brown, 2.5-3 mm. long, bristly spines per areole.
Receptacle covered with areoles, lower scales 1 mm. long and 0.5 mm. wide, upper scales 2.5 mm. long and 0.5 mm. wide; with a few white hairs and 2 bright brown, 11 mm. long, bristly spines per areole.
Outer perianth segments spathulate, 6-13 mm. long, 1-2 mm. wide, acuminate with finely-toothed margin, yellow with rose-colored tip.
Inner perianth segments spathulate, 13-15 mm. long, about 2 mm. wide, acuminate, yellow. Style 12 mm. long, 1 mm. thick, yellow-white, Stigma lobes 8, 3 mm. long, with white papillae.
Primary stamens 7 mm. long, yellow, standing erect around the style; secondary stamens 6 mm. long, yellow, standing parallel to the inner part of the receptacle.
Fig. 3
Fig. 3. B: exterior of the flower; B1 and B2: scales on the receptacle; B3: outer perianth segment; B4: inner perianth segment.
 
Anthers ca. 0.8 mm. long, yellow.
Seed chamber 4.5 mm. long, 3.5 mm. wide, ovules marginal.
Fruit somewhat flattened globose, 5-6 mm. long, 6-7 mm. wide, covered with a few hairs and brown bristles per scale areole in the upper portion; the fruit becomes dry and the flower remains are persistent.
Fig. 4C Fig 5
Fig. 5 (above). D: spine areole, approx. X 9 (Drawings by A. J. Brederoo).
Fig. 4C1 Fig. 4C2 Fig. 4 (left). C: seed; C1: hilum-side with (M) micropyl; C2: uncovered embryo with cotyledons clearly visible, but lacking perisperm.
C2

Seed
boat-shaped, 2.1-2.2 mm. long, 1.8 mm. wide, chestnut-brown, glossy, with reticulate pattern; hilum oblong-oval, separated by very thin tissue; a deep hole is left after the disin­tegration of the funicle; embryo without perisperm.
Habitat: in the southern part of Mato Grosso in Brazil, on the flanks of the Serra de Mara-caju, at 270-300 m., on small hills in sandy soil, always somewhat shaded by grass and small shrubs.
The holotype of this plant is deposited in the herbarium of the Botany Department of the University of Utrecht, Netherlands, under the collection number HU 192.

This species was discovered by Werner Uebelmann and Leopoldo Horst on December 26, 1967. At the locality the plant is abundant.
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