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Micrograph of an ant by Dennis Kunkel Phototake. Discover why a mother's immune system ignores the child in her womb www.sciam.com explorations 2000 012400preg Check every week for original features and this month's articles linked to science resources on-line. Scientific American (ISSN 0036-8733),published monthly by Scientific American,Inc.,415 Madison Avenue,New York,N.Y.10017-1111. Copyright 2000 by Scientific American,Inc.All rights reserved.No part of this issue may be reproduced by any...

Of The Atlantic Forest

FRAGMENTS of the Brazilian Atlantic Forest are often found around densely populated areas on the coast. This Alcantarea gla-ziouana (1), for instance, was discovered above the city of Niteroi, which is just east of Rio de Janeiro. Retrieving the specimens is not always so easy, however. Often biologists have to climb high trees or scale steep inclines, as Thelma Barbar did when she tried to collect Dyckia encholiri-oides (2). But sometimes the brilliant hues of a bromeliad in bloom help the...

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