Collecting localities



Biographical data

Photo gallery


Jaag, Otto


(Source: Flora Malesiana ser. 1, 1: Cyclopaedia of collectors)

(Source: Flora Malesiana ser. 1, 1: Cyclopaedia of collectors, Addenda & Corrigenda)

(Source: Flora Malesiana ser. 1, 8: Cyclopaedia of collectors, Supplement II)


Born: 1900, Beringen, Kanton Schaffhausen, Switzerland.



Schoolteacher at Beringen, 1921-24; botanist, educated at Geneva University, in 1929 taking his Ph. Dr on a study on lichens Assistant at the Plant Physiological Institute of the Technical College, Zürich, 1929-32; from 1932 onwards at the Institute for Special Botany of the same College; in 1941 with the honorary title of Professor, and in 1945 Extraordinary Professor of Special Botany (cryptogams and hydrobiology).

In Oct. 1937 he went on a study tour to the Dutch East Indies, working for several months in the Foreigners’ Laboratory at Buitenzorg and Tjibodas for the study of epiphyllous lichens in the tropics.1 He made a 3-month collecting journey in the Lesser Sunda Islands, accompanied by the Assistant Curator of the Buitenzorg Botanic Garden, C.L.L.H. van Woerden (see there). In December 1938 he was back in Europe.

Author of numerous papers on cryptogams, hydrobiology, plant pathology, ecology, etc.


Collecting localities:

1938. E. Soembawa: kp. Lampe (Apr. 24); Soemba: Waingapoe (25); Timor: Forest Reserve near Koepang (27); hilly country above Timor-Dilly (Port. Timor) (28); Alor: Kabola Peninsula (May 1-5); Koei Distr., Moroe-Gendok (7); visiting the north coast, Kalabahi, Likoeatang, Taramana and Pisigomo (May 9-11); Pisigomo-Lantoka, Lake Apengmana (12-13); Lantoka-Naumang, G. Kojakoja, Merjak, Lantoka, Pido, Woisika (all on the central plateau, 14-20) ; Woisika-Saumassi, Atimelangand Kalabahi (21-23); Flores: Keli Moetoe (June 5); Boa-Wae-Mborong (9); Roeteng and G. Kasteno (10); Rana mesé near Roeteng (11); SW. Celebes: Makassar-Bantirmoeroeng (16); Bali: Bedoegoel (20), Lake Bratan (20); kp. Tioemarga (21); Den Passar (24).



Herb. Bog. [BO] and Techn. Coll. Zürich [ZT]: 1956 nos (several of which lost), including rather many Fungi, Algae, Musci and other cryptogams. The numbering is not strictly chronological, it runs as follows: Soembawa nos 2-18, Soemba nos 19-47, Timor nos 49-130, Alor nos 132-1496, Celebes nos 1652-1688, Bali nos 1689-1709 and 1763-1797, Flores the intermediate nos and the greater part of those following 1797 (also including plants from other localities, forgotten material, etc.).

The Fungi were identified by Dr K.B. Boedijn.2



(1) O. Jaag: ‘Reisebriefe aus Java’ (Mitt. Naturf. Ges. Schaffhausen 14, 1938, p. 173-183); ‘Ergebnisse einer botanischen Studienreise nach Niederländisch-Indien 1937/38, I. Untersuchungen über den Rhytmus der Lauberneuerung, die Lebensdauer der Blätter and den Epiphytenbefall bei einigen Farnen in den Tropen’ (l.c. 18, 1942/43, p. 205-257, 4 tabl., 3 pl.).

(2) ‘The Fungi collected by Dr O. Jaag in Alor, Bali and Flores (Lesser Sunda Islands)’ (Bull. Jard. Bot. Buit. sér. 3, vol. 16, 1940, p. 245-252, 3 fig.).


biographical data:

In Festschrift O. Jaag (Schweiz. Z. Hydrobiol. 22, 1960, p. 9-17, portr.); Wasser Abwasser 111, 1970, p. 175-246, portr. (70 years old).


photo gallery:


June 1948

c. 1974

c. 1978