intermountainbiota.org - Intermountainbiota is a network of SYMBIOTA portals (such as SEINET, OregonFlora, CNH, SERNEC, etc.), and brings together data from hundreds of thousands of herbarium specimens from herbaria all across the world.
mycoportal.org - Portal for collection records retaining to higher fungi (excluding lichens).
lichenportal.org - Portal for collection records retaining to lichenized fungi.
bryophyteportal.org - Portal for collection records retaining to bryophytes (also known as mosses, liverworts, and hornworts).
www.gbif.org- GBIF, the Global Biodiversity Information Facility, is the primary aggregator of the metadata associated with natural history collections. Unlike SYMBIOTA portals, however, GBIF does not provide images of specimens.
Herbarium curation
See this video seriesfor a behind-the-scenes tour of how herbaria curate plant specimens.