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ORCHID SPECIES CULTURE Charles and Margaret Baker Masdevallia strobelii Sweet and Garay AKA: N/A. ORIGIN/HABITAT: Ecuador. Plants have been found in only one cloudforest area in one remote valley in southeast Ecuador between Loja and Zamora. They grow in bright light in tree tops and on fence posts at about 4600 ft. (1400 m). CLIMATE: Station #84265, Loja, Ecuador, Lat. 4.0S, Long. 79.4W, at 4062 ft. (1238 m). Temperatures are calculated for an elevation of 4600 ft. (1400 m), resulting in probable extremes of F (C) and F (C). N/HEMISPHERE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC F AVG MAX 82 83 84 83 84 85 83 81 82 82 82 82 F AVG MIN 64 63 62 62 61 63 63 63 63 63 62 62 DIURNAL RANGE 18 20 22 21 23 22 20 18 19 19 20 20 RAIN/INCHES 0.2 0.2 0.1 1.3 0.7 0.5 0.9 1.7 1.4 2.1 1.0 0.2 HUMIDITY/% N/A BLOOM SEASON * * * * DAYS CLR N/A RAIN/MM 5 5 3 33 18 13 23 43 36 53 25 5 C AVG MAX 27.8 28.3 28.9 28.3 28.9 29.4 28.3 27.2 27.8 27.8 27.8 27.8 C AVG MIN 17.8 17.3 16.8 16.8 16.2 17.3 17.3 17.3 17.3 17.3 16.8 16.8 DIURNAL RANGE 10.0 11.0 12.1 11.5 12.7 12.1 11.0 9.9 10.5 10.5 11.0 11.0 S/HEMISPHERE JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN Cultural Recommendations: LIGHT: 1200-2000 fc. Rather bright conditions are required. Light should be filtered or diffused, and plants should not be exposed to direct sun. Strong air movement should be provided at all times. TEMPERATURES: Throughout the year, days average 81-85F (27-29C), and nights average 61-64F (16-18C), with a diurnal range of 18-23F (10-13C). HUMIDITY: Probably more than 80% year-round in the cloudforest habitat. WATER: Rainfall at the weather station is light throughout the year. Moisture in the cloudforest habitat is much greater than indicated, however, and additional moisture is available from heavy dew, fog and mist. Cultivated plants should be kept evenly moist all year. They should never be allowed to dry out completely. FERTILIZER: A balanced fertilizer mixed at 1/4-1/2 recommended strength should be applied every 3-4 weeks if plants are grown in sphagnum moss, tree-fern fiber, or osmunda. If grown in fir bark, the applications should be made every 1-2 weeks. Many growers prefer to switch from the normal balanced formula and make an application of high nitrogen fertilizer early in the year when plants are actively growing. They may then make an application of a high phosphate or "bloom booster" formula in late summer or autumn in order to promote flowering. REST PERIOD: Growing conditions should be maintained all year. Water may be reduced somewhat for cultivated plants in winter, especially those grown in the darker, short-day conditions common in temperate latitudes. They should never be allowed to dry out completely, however. Fertilizer should also be reduced somewhat when light is low, days are short, or water is reduced. GROWING MEDIA: Plants may be mounted on tree-fern or cork slabs if humidity is high and plants are watered at least once daily in summer. Several waterings a day may be necessary for mounted plants during very hot, dry periods. Because most growers find it difficult to keep mounted plants moist enough, they are usually grown in pots using an open, fast draining medium which contains materials that retain some moisture such as chopped sphagnum or perlite. Charcoal is often added to help keep the medium open and prevent it from becoming sour. Most growers recommend that plants be repotted every year. Repotting is usually done in late winter or early spring, but it may be done anytime between autumn and spring that does not interfere with flowering. MISCELLANEOUS NOTES: The bloom season shown in the climate table is based on cultivation records. Plant and Flower Information: PLANT SIZE AND TYPE: A small epiphyte that grows 2.4-3.5 in. (6-9 cm) tall including the ramicaul at the base of each growth. These slender secondary stems are 0.8-1.2 in. (2-3 cm) long and are enclosed by 2-3 loose tubular sheaths. LEAVES: 1.6-2.4 in. (4-6 cm) long including a 0.4-0.8 in. (1-2 cm) petiole. A single erect, elliptical, leathery leaf is carried on each growth. INFLORESCENCE: 1.2-1.8 in. (3.0-4.5 cm) long. The slender, suberect to horizontal peduncle emerges from a node low on the secondary stem. More than one flowering stem can be produced by each growth. FLOWERS: 1 per inflorescence. Plants often make many new growths and carry a profusion of flowers, however. The sepals are white but are intensely suffused with bright orange on the basal half. Their upper halves are densely covered with small glandular areas which in turn are covered with small hairs. The dorsal sepal is about 0.6 in. (1.6 cm) long and is connected to the lateral sepals for almost its entire length forming a cylindrical sepaline tube. The free tip portion is abruptly contracted into a slender, erect, yellow-orange tail which is 1.2-1.6 in. (3-4 cm) long. The lateral sepals are slightly longer than the dorsal sepal and are connected to each other for most of their length forming an egg-shaped area about 0.7 in. (1.8 cm) long and 0.8 in. (2.0 cm) wide. The rounded tips of the lateral sepals are also abruptly contracted into yellow-orange tails 1.2-1.6 in.(3-4 cm) long. The small, oblong petals are yellow-orange, the lip is white, and the column is yellow-white. HYBRIDIZING NOTES: N/A. REFERENCES: Hamilton, R. 1990. Flowering months of orchid species under cultivation. Orchid Biology Reviews and Perspectives, V. J. Arditti, ed. Timber Press, Portland, Or. Index Kewensis.  1983. Supplement XV (1966-1970). Plantarum Phanerogameram. An enumeration of the genera and species of flowering plants. Oxford University Press, Amen House, London E. C. 4. Reprint by Otto Koeltz Science Publishers, D-6240 Koenigstein/West Germany. Luer, C. 1983. Thesaurus Masdevalliarum. Part 1. A monograph of the genus Masdevallia. Verlag Helga Königer Buchersand, Von-Erckert str. 36, 8000 Munich 82, Germany. Pridgeon, A. ed. 1992. The illustrated encyclopedia of orchids. Timber Press, Portland, OR. Skittrell, S. 1994. Masdevallias. S. and G. S. c/o Pleurothallid Alliance. PHOTOS/DRAWINGS: Luer, C. 1983. Thesaurus Masdevalliarum. Part 1. A monograph of the genus Masdevallia. Verlag Helga Königer Buchersand, Von-Erckert str. 36, 8000 Munich 82, Germany. Pridgeon, A. ed. 1992. The illustrated encyclopedia of orchids. Timber Press, Portland, OR. Copyright 1997, Charles O. Baker and Margaret L. Baker Sheet version 8077220 ......................................................................... Please remember that this sheet is for your use only, and though it was provided free of charge, it may not be reproduced or retransmitted in any way without permission. ......................................................................... __________________________________________________________________________ "Orchid Species Culture" Charles & Margaret Baker, Portland, Oregon USA Orchid Culture & Pollination site http://www.orchidculture.com email <firstname.lastname@example.org> __________________________________________________________________________ "Orchid Species Culture Vol. 1 - Pescatorea, Phaius, Phalaenopsis, Pholidota, Phragmipedium, Pleione" 250 pages of culture information. "Orchid Species Culture Vol. 2 - Dendrobium" 850 pages of culture information for more than 1230 Dendrobium species. "The genus Paphiopedilum--Natural History and Cultivation" - Part 1 Dr. Guido Braem, Charles and Margaret Baker ISBN 0-9665337-0-4 Full page color photograph of each species. "The genus Paphiopedilum--Natural History and Cultivation" - Part 2 Dr. Guido Braem, Charles and Margaret Baker ISBN 0-9665337-1-2 Full page color photograph of each species. "Orchid Species Culture Vol. 3 - The Laelia/Cattleya Alliance" coming in a few months. __________________________________________________________________________