Historic Indonesian plant collection rediscovered in Basel

A dusty box in Basel has shattered an 80-year-old assumption that robbed the scientific community of invaluable history. For decades, the narrative was absolute: the botanical treasures collected by the legendary Basel naturalists Fritz and Paul Sarasin were obliterated in the inferno of the Second World War. Scientists had long resigned themselves to the belief that these specific pocket herbaria were incinerated during the catastrophic 1943 bombing of the Berlin herbarium.

However, a recent audit has defied this tragic history. In a stunning turn of events, experts from the Swiss Natural History Collections Network (Swisscollnet) and the University of Basel unearthed the intact specimens sitting quietly in storage, completely untouched by the flames of Berlin. This is not merely a recovery; it is a resurrection of scientific data thought to be extinguished forever. The discovery proves that while the war claimed much of Europe's cultural heritage, Basel's archives held a secret that has now rewritten the record books.

The magnitude of this find rests on 28 specific dried plants. These are not just pressed leaves; they are "type specimens"—the original physical benchmarks used to scientifically describe species found nowhere else on Earth. When the Sarasin cousins explored the Indonesian island of Sulawesi, they documented biodiversity that was, at the time, completely unknown to Western science.

Recovering these 28 specimens is a massive victory for taxonomy. Without type specimens, the scientific definition of a species can become ambiguous, hindering research and conservation efforts. These plants provide the definitive genetic and morphological reference points that modern botany demands. The pocket herbaria, bulging with these unique samples, serve as a direct link to the pristine ecosystems of 19th-century Indonesia, offering data that is impossible to replicate in today's rapidly changing climate.

Paul Sarasin (1856-1929) and Fritz Sarasin (1859-1942) are titans of Swiss natural history, yet a significant portion of their legacy was thought to be lost to the chaos of the 20th century. Their expeditions to Sulawesi were perilous and pioneering, yielding biological insights that helped shape our understanding of biogeography in the region.

The rediscovery of their pocket herbaria in Basel does more than restore a collection; it restores the integrity of their life's work. These men ventured into the unknown, bringing back evidence of life that the world had never seen. To find these artifacts now, hidden in plain sight within their home city of Basel, adds a poetic layer to the scientific triumph. It underscores the critical importance of Switzerland's role as a guardian of global scientific heritage, preserving records that transcend borders and survive even the most destructive global conflicts.

The 28 Sulawesi specimens are just the tip of the iceberg. The comprehensive audit and subsequent digitization project have revealed a staggering total of over 140 types previously obscured in the archives. This includes a significant collection of ferns and materials from New Caledonia, further expanding the scope of the recovery.

Among these treasures is the Thelymitra sarasiniana, an orchid species named after the researchers, which was also feared lost. The University of Basel and Swisscollnet are now racing to digitize these finds, ensuring that this data is not only physically safe but globally accessible. By moving these artifacts from a "dusty box" to a digital database, Switzerland is unlocking a vault of biological data for researchers worldwide, proving that the most exciting discoveries often happen not in the field, but deep within the archives.