ABSCTRACT -(High irradiance and temperature inhibit the germination of spores of the fern Rumohra adiantiformis (Forst.) Ching (Dryopteridaceae)). Rumohra adiantiformis (Forst.) Ching is a fern (Dryopteridaceae) which is used to compose floral arrangements. Fertile fronds were harvested in the "Permanently Protected Area" of Ilha Comprida, São Paulo, Brazil. Sterilized spores were germinated in Mohr liquid medium modified by Dyer. The effect of 72%, 54%, 17% and 9% of total irradiance on germination under field conditions, was analyzed. Experiments were carried out in March (I), April (II) and August of 2000 (III). Under 54% and 72% of total irradiance in Experiment I (March) the germination was completely inhibited and partially inhibited under 72% of total irradiance in Experiment II (April). The lowest mean germination time ( t -) was observed under 9% of total irradiance in Experiments II (11.62 days) and III (8.80 days) respectively, followed by 17% in Experiment III (10.12 days) and 9% of total irradiance in the Experiment I (11.62 days ). The effect of temperatures of 15 ± 1, 20 ± 1, 25 ± 1 and 30 ± 1 ºC on germination was also analyzed. The lowest mean germination time (7.93 days) was observed at 25 ± 1 °C followed by 20 ± 1 °C. The highest mean germination time was observed at 15 ± 1 °C (12.10 days) followed by 30 ± 1 °C (10.63 days), which inhibited germination. The germination of R. adiantiformis was photoinhibited by high irradiance and partially inhibited by the highest temperature tested.RESUMO -(Alta irradiância e temperatura inibem a germinação de esporos da samambaia Rumohra adiantiformis (Forst.) Ching (Dryopteridaceae)). Rumohra adiantiformis (Forst.) Ching é uma pteridófita (Dryopteridaceae) usada para compor arranjos florais. Frondes férteis foram coletadas na "Área de Preservação Permanente" Ilha Comprida, São Paulo, Brasil. Esporos esterilizados germinaram em meio de Mohr modificado por Dyer. O efeito de 72%, 54%, 17% e 9% de irradiância total sobre a germinação em condições ambientais, foi analisado. Experimentos foram conduzidos em março (I), abril (II) e agosto (III) de 2000. Sob 54% e 72% de irradiância total, em março a germinação foi completamente inibida e parcialmente inibida sob 72% de irradiância em abril. O menor tempo médio de germinação ( t -) foi observado sob 9% de irradiância total nos Experimentos II (7,93 dias ) e III (8,80 dias), respectivamente, seguidos de 17% no Experimento III (10,12dias ) e 9% de irradiância solar total no Experimento I (11,62 dias). O efeito de temperaturas de 15 ± 1, 20 ± 1, 25 ± 1 e 30 ± 1 ºC sobre a germinação também foi analisado. O menor tempo médio de germinação (7,93 dias) foi observado a 25 ± 1 °C seguido de 20 ± 1 °C. O maior tempo médio de germinação foi observado a 15 ± 1 °C (12,10 dias) seguido de 30 ± 1 °C (10,63 dias), que inibiu a germinação. A germinação de R. adiantiformis foi fotoinibida pela alta irradiância e parcialmente inibida pela temperatura mais alta testada.
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