In the coastal forests of northern California, redwood (Sequoia sempervirens) reigns supreme. Individual trees can exceed 112 m in height, and individual forest stands can have a biomass over 3,000 metric tons per hectare. Ancient redwoods often have complex crowns consisting of many reiterated trunks, some of which are larger than full-size trees in other forests. This study focuses on the second largest known living redwood, a 91.5 m tall tree with a total stemwood volume of 1,032.8 m3. There are 134 reiterated trunks in its crown, accounting for 12.3 percent of its total stemwood volume. Five of these trunks are 1.0-2.6 m basal diameter, and fifteen are 0.5-1.0 m basal diameter. One section of the crown includes a class 6 reiteration (i.e., a trunk from a trunk from a trunk from a trunk from a trunk from a trunk from the main trunk). Many of the trunks are hydraulically linked to other trunks by fused branches. Deep layers of crown humus have accumulated on large branches and crotches formed by multiple trunks. This humus supports epiphytic ferns, shrubs, and trees, and it is home to a population of salamanders (Aneides vagrans). The tree also exploits this humus resource via adventitious roots.