Rexie

Rexiella forms shrubby tufts of upright secondary branches known as . The fragile primary crust quickly weathers away, so the eye is drawn to the green- to yellow-tinged pseudopodetia, which stand 2.5–14 cm tall and about 2–4 mm across. They are stiff and horn-like when dry but soften to a spongy texture after rain. Each stalk is irregularly ridged or angular, may divide a few times, and is riddled with narrow, window-like holes that give the surface a lace-like appearance. A thin, sometimes glossy cortex is dusted with minute crystals. Inside, the usual central cavity is almost completely packed with a loosely woven medulla that can be white near the tips but grades to charcoal grey or…