Achnanthes biasolettiana var. sublinearis Grunow ex Van Heurck (original description)
Achnanthes gibberula var. angustior Grunow in Van Heurck, 1882-1885 (original description)
Achnanthes lanceolata f. minuta Grunow in Van Heurck, 1880-1887 (original description)
Actinocyclus subtilis var. subdivisa Grunow in Van Heurck, 1884 (original description)
Amphipleura lindheimeri var. truanii Van Heurck, 1884 (original description)
Amphora belgica Grunow (original description)
Amphora cymbifera var. gigantea Grunow in Van Heurck (original description)
Amphora laevissima var. perminuta Grunow in Van Heurck (original description)
Amphora perpusilla Grunow, 1884 accepted as Amphora globulosa var. perpusilla Grunow, 1880 (new combination reference)
Amphora scotica ‘Cleve' according to Van Heurck (taxonomy source)
Amphora scotica f. minor Grunow in Van Heurck (original description)
Amphora taylori Grunow in Van Heurck (original description)
Cymbella affinis var. truncata Grunow in Van Heurck, 1880-1885 (original description)
Cymbella cuspidata var. obtusiuscula Grunow, 1882-1885 † (original description)
Cymbella helvetica var. abbreviata Grunow, 1882-1885 (original description)
Cymbella helvetica var. obtusa Grunow in Van Heurck, 1880-1885 (original description)
Cymbella helvetica var. scotica Grunow in Van Heurck, 1880-1885 (original description)
Cymbella obtusa var. diminuta Grunow, 1882-1885 (original description)
Cymbella subaequalis var. incerta (Grunow) Grunow, 1882-1885 accepted as Cymbella incerta Grunow, 1878 (new combination reference)
Cymbella turgidula var. brevis Grunow in Van Heurck, 1880-1885 (original description)
Denticula elegans var. ocellata (W.Smith) Grunow, 1882-1885 accepted as Denticula ocellata W.Smith, 1856 (new combination reference)
Encyonema ventricosum var. lunula Grunow in Van Heurck, 1880-1885 (original description)
Encyonema ventricosum var. perminuta Grunow in Van Heurck, 1880-1885 (original description)
Epithemia gibberula var. protracta Grunow in Pantocsek, 1886 (original description)
Eunotia paludosa var. arculus Grunow in Van Heurck, 1884 (original description)
Hantzschia hyalina Grunow, 1884 (original description)
Janischia A. Grunow in H. Van Heurck, 1883 (original description)
Mastogloia braunii var. baldjikiana Grunow in Van Heurck, 1880-1885 (original description)
Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (original description)
Microspodiscus A. Grunow in H. Van Heurck, 1883 (original description)
Navicula brebissonii Grunow in Van Heurck (original description)
Navicula bulnheimii var. belgica Grunow, 1885 (original description)
Navicula cryptocephala var. intermedia Van Heurck, 1880-1885 (original description)
Nitzschia linearis var. major Grunow in Van Heurck, 1880-1885 (original description)
Nitzschia linearis var. subsigmoidea Grunow in Van Heurck, 1880-1885 (original description)
Nitzschia normanii Van Heurck, 1880-1885 (original description)
Pleurosigma scalprum var. gallicum Grunow in Van Heurck, 1880-1885 (original description)
Pleurosigma spenceri var. acutiuscula Grunow in Van Heurck, 1880-1885 (original description)
Pseudocoscinodiscus A. Grunow in H. Van Heurck, 1883 (original description)
Stoschia C. Janisch ex Grunow in H. Van Heurck, 1883 † (original description)
Synedra crystallina var. conspicua Grunow in Van Heurck, 1885 (original description)
Synedra fulgens var. conspicua Grunow in Van Heurck, 1885 (original description)