A manual of the genus Usnea, as represented in North and Middle America north of the 15th parallelPublished in Bulletin of the Torrey Botanical Club, in 1910, in volume 37, pages 1-18New species of Uredineae. VIIPublished in Bulletin of the Torrey Botanical Club, in 1910, in volume 37, pages 569-580
New species of Uredineae. VIIPublished in Bulletin of the Torrey Botanical Club, in 1910, in volume 37, pages 569-580