Kurt Sprengel

Tuber aestivum (summer truffle) or Tuber uncinatum (burgundy truffle) is a species of truffle found across Europe.

Cladonia coniocraea, commonly known as the common powderhorn or the powderhorn cup lichen, is a species of fruticose, cup lichen in the family Cladoniaceae. It was first described by Heinrich Gustav Flörke in 1821 under the name Cenomyce coniocraea, until Kurt Polycarp Joachim Sprengel reclassified it under the genus Cladonia in 1827. As of July 2021, its conservation status has not been estimated by the IUCN. In Iceland, its conservation status is denoted as data deficient (DD).

Trypethelium is a genus of lichenized fungi in the family Trypetheliaceae. The widespread genus contains about 50 species predominantly found in tropical areas. Trypethelium was circumscribed by German botanist Kurt Polycarp Joachim Sprengel in 1804.

Cladonia cariosa is a species of fruticose lichen in the family Cladoniaceae. The species is characterised by its thick, tongue-shaped basal scales and upright grey-green stalks that lack the cup-like structures found in many related lichens, instead being topped with large chocolate-brown fruiting bodies. It has a cosmopolitan distribution and commonly grows on soil in both calcium-rich and calcium-poor sites across northern North America. The lichen is also known by the common names split-peg lichen and split-peg soldiers.

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Zeora strobilina, also known as the mealy rim lichen, is a species of crustose lichen in the family Lecanoraceae. It was originally described as Parmelia strobilina by German botanist Kurt Polycarp Joachim Sprengel in 1827. The species was long treated in Lecanora, but was later transferred to Zeora when that genus was resurrected for the former Lecanora symmicta group in 2025. It is distributed across North America and the Mediterranean region, and has also become established in South America and the Galápagos. It can be distinguished from other closely related species, including Z. confusa,