Masdevallia posadae forma rugosepala A.Doucette & J.Portilla, 2016

Doucette, Alfonso, Portilla, Jose & Cameron, Kenneth M., 2016, Ten new taxa in the orchid subtribe Pleurothallidinae (Epidendroideae, Epidendreae) from Ecuador, Phytotaxa 257 (3), pp. 230-248 : 235

publication ID

https://doi.org/ 10.11646/phytotaxa.257.3.2

DOI

https://doi.org/10.5281/zenodo.13670568

persistent identifier

https://treatment.plazi.org/id/03B987A5-BA50-3466-A796-391150CCF9F2

treatment provided by

Felipe

scientific name

Masdevallia posadae forma rugosepala A.Doucette & J.Portilla
status

f. nov.

Masdevallia posadae forma rugosepala A.Doucette & J.Portilla View in CoL , f. nov. ( Figs. 4 View FIGURE 4 , 11C View FIGURE 11 )

Type:— ECUADOR. Without a specific locality, flowered in cultivation at Ecuagenera Orchid Nursery, 4 September 2015, Doucette 0308 (holotype: HA).

Diagnosis: The form differs from M. posadae f. posadae ( Luer 1982a: 74) in having rugose sepals and shorter thicker tails.

Epiphytic, caespitose herbs, roots 1 mm in diam. Stems 14–17 5 3 mm, enveloped by 2–3 papery sheaths, 5–25 5 5–7 mm. Leaves spathulate, 100–170 5 17–20 mm. Inflorescence a successively flowered raceme; peduncle triquetrous, 15–280 5 3 mm; bracts 14–17 5 4–6 mm; pedicel 15–25 5 4–6 mm; ovary 4 5 2 mm; dorsal sepal ovate, yellow suffused with orange, 14 5 7 mm, contracted into a yellow tail, 31 5 2 mm wide; the lateral sepals ovate, rugose, 24 5 5.5 mm, contracted into a yellow tail, 20 5 2 mm; the petals white, oblong, 6 5 2 mm; column 5.5 5 1.5 mm.

Etymology:— From the Latin ruga meaning “wrinkle” and sepalus meaning “sepal”. The name refers to the sepals, which distinguish this form from the typical form.

Notes:— Masdevallia posadae f. rugosepala appears to be an unusual phenotype of M. posadae , a species that had not be previously reported from Ecuador. An individual of the form described here was self-pollinated at Ecuagenera and produced individuals with rugose and non-rugose sepals in addition to individuals with short thick tails and long thin tails. The form is striking and appears distinct from M. posadae , but the traits distinguishing the typical form and the new form described here appear to be phenotypic variation within the species. No forms of Masdevallia posadae are reported by International Plant Names Index (2016) or Luer (2000). We feel the aberrant individual described here could be confused with an undescribed species, and therefore it is useful to indicate to other researchers its presence with its formal description.

HA

Universidad del Azuay

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