bigcone Douglas fir References bigcone Douglas fir plant Ask Anything Homework Help Also known as: Pseudotsuga macrocarpa Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Douglas fir/ Major speciesThe bigcone Douglas fir (P. macrocarpa), a smaller species important only for erosion control, bears cones 10 to 15 cm (about 4 to 6 inches) long. Read MoreThe bigcone Douglas fir (P. macrocarpa), a smaller species important only for erosion control, bears cones 10 to 15 cm (about 4 to 6 inches) long. Read More