6 TEXAS RESEARCH FOUNDATION: CONTRIBUTIONS, VOLUME 5 
All species of Parathesis are represented in the Lundell Herbarium by type 
photographs and photographs of most of the isotypes. In addition, a series of 
photographs of collections of each species has been made to show variation. 
Together with types, isotypes, drawings of every taxon, and series of specimens 
of most species, the collection in the Lundell Herbarium is the most representa- 
tive of the genus. This assemblage of material has been greatly enhanced by 
cooperating officials of herbaria, particularly at Copenhagen, Stockholm and 
Geneva, who have released historic duplicates of Parathesis, including isotypes. 
