INTERSPECIFIC HYBRIDIZATION WITHIN THE GENUS BETULAHELGE JOHNSSON · 1945

CYTOLOGICAL STUDIES OF TRIPLOID PROGENIES OF POPULUS TREMULAHELGE JOHNSSON · 1942

MEIOTIC ABERRATIONS AND STERILITY IN ALOPECURUS MYOSUROIDES HUDSHELGE JOHNSSON · 1944

ON THE C0 AND C1, GENERATIONS IN ALNUS GLUTINOSAHELGE JOHNSSON · 1950

CHROMOSOME NUMBERS OF TWIN PLANTS OF QUERCUS ROBUR AND FAGUS SILVATICAHELGE JOHNSSON · 1946

CYTOLOGICAL STUDIES OF DIPLOID AND TRIPLOID POPULUS TREMULA AND OF CROSSES BETWEEN THEMHELGE JOHNSSON · 1940

STUDIES ON BIRCH SPECIES HYBRIDS : I. BETULA VERRUCOSA X B. JAPONICA, B. VERRUCOSA X B. PAPYRIFERA AND B. PUBESCENS X B. PAPYRIFERAHELGE JOHNSSON · 1949