-(Richness of rust fungi on host plants in Belém Metropolitan Area, Pará State, Brazil). This study had as objectives: to survey the fungi that cause rust (Pucciniales) in RMB, to identify species of rust parasitizing plants of economic interest, and to present findings of new records to South America, Brazil, Amazon and Pará, thus broadening the knowledge of the richness of the group and the relationships with their host plants. Collections were made in RMB in 2011-2013 period, and the MG (MPEG) and IAN (EMBRAPA) herbaria were revised. The RMB presented 76 species and 20 genera of Pucciniales. Fourteen species are new records: South America (one), Brazil (one), Amazon (five), State of Pará (one), and RMB (six). Twenty species of rust parasitize plants of economic interest. The RMB has the highest Pucciniales richness in the Amazon. Keywords: Amazon, phytopathogens, Pucciniales, survey RESUMO -(Riqueza de fungos causadores de ferrugens em plantas hospedeiras da Região Metropolitana de Belém, PA, Brasil). Este estudo teve por objetivos inventariar os fungos causadores de ferrugens (Pucciniales) na RMB, identificar espécies de ferrugens que parasitam plantas de interesse econômico, apresentar novos registros para a América do Sul, Brasil, Amazônia e Estado do Pará, e assim ampliar o conhecimento sobre a riqueza do grupo e da relação com suas plantas hospedeiras. Foram realizadas coletas na RMB no período de 2011-2013, e revisados os herbários MG (MPEG) e IAN (EMBRAPA). A RMB apresentou 76 espécies e 20 gêneros de fungos Pucciniales. Quatorze espécies são novos registros: para a América do Sul (uma), Brasil (uma), Amazônia (cinco), Estado do Pará (uma) e RMB (seis). Vinte espécies de ferrugens parasitavam plantas de interesse econômico. A RMB apresenta a maior riqueza de espécies de Pucciniales estudada na Amazônia.

This research aimed to characterize the biometry of seeds, the morphology of seedlings and to evaluate the initial growth of blue jacaranda trees (Jacaranda mimosifolia D. Don.) in two environments with distinct luminosity. The biometry of 100 de-winged seeds was measured by their length, width and thickness. One hundred seeds were sown into 300 cm3 tubes and seedlings morphology was registered throughout the germination process using digital photographs disposed sequentially according to seedlings age. The initial growth analysis was performed in two environments, full sun and greenhouse, during nine periods, and arranged in a complete randomized design with subplots. The response variables were: number of leaves, plant height, collar diameter, root length, aerial and roots dry weight, and Dickson’s Quality Index (DQI). Biometry results showed seeds 7.09 - 9.26 mm long, 6.74 -9.39 mm wide, and 1.11 -1.89 mm thick. Germination is of hypogealphanerocotylar type, with first root arising six days after sown. Plants at full sun presented larger collar diameters, greater root dry weight and higher DQI as evaluation periods passed by. In conclusion, the biometry of seeds and the morphology of seedlings of blue jacaranda can be used to recognize this species in the field. Plants at full sun presented better development. Seedlings cultivated at full sun can be destined to recuperate forests and degraded areas just 36 weeks after sowed.