Tubercle Gallery

Flowering hatchet cactus, with flattened spine clusters. Pelecyphora aselliformis

Flowering hatchet cactus, with flattened spine clusters. Pelecyphora aselliformis. Like peyote, this is a psychoactive species of cactus used by indigenous peoples of central Mexico, where it is native. Garden in Tucson, Arizona, USA

© Thomas Wiewandt / DanitaDelimont.com

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A pair of Pygmy seahorse on sea fan, Lembeh Strait, Indonesia

A pair of Pygmy seahorse (Hippocampus bargibanti), side by side, red variety, on sea fan, Lembeh Strait, Indonesia

© Steve Jones/Stocktrek Images

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Art of pulmonary tuberculosis with lung cavities

Pulmonary tuberculosis. Illustration of a human lung diseased with pulmonary tuberculosis. At centre right is the affected lung seen sectioned through; at left is the heart with its associated blood vessels. In pulmonary tuberculosis the air sac alveoli of the lung become filled with an inflammatory exudate (yellow). The exudate is made of macrophages (white blood cells) and bacteria which cause the infection Mycobacterium tubercu- losis. The walls of alveoli have disintegrated in places, forming cavities (upper centre). Lesions or tubercles of infection are visible (white). Tuberculosis is an infectious lung disease which, although still a killer, can now be cured

© JOHN BAVOSI/SCIENCE PHOTO LIBRARY