54 PETOH : 



From that book it appears that Thiinberg collected three 

 species of " Arum " in Ceylon, viz., Arum peregrinum L., Arum 

 macrorhizon Thunb., and Arum ceilanicum. 



Arum peregrinum L. is Alocasia macrorrJiiza (L.) Schott. 

 The sheet in Herb. Thunberg bears two specimens, but only 

 the locality Ceylon, though Thunberg enumerated this species 

 in Florula Javanica. According to Schott (in Herb. Thunberg), 

 the specimen is an undetermined Homalomena. If so, it is 

 not a Ceylon specimen, no species of Homalomena being known 

 in Ceylon. 



Arum macrorhizon Thunb., according to the herbarium speci- 

 mens, is a mixture, the Java plant of Florula Javanica, 1825, 

 being different from that of Florula Ceilanica, 1825. The 

 latter is marked Ceilan by Thunberg, but according to Schott's 

 note on the sheet it is Leucocasia gigantea Schott [=Colocasia 

 gigantea Hook. =C alocasia indica of Engl., Araceae, 494 (non 

 Kunth), according to the synonyms in Flora British India]. 

 Here, again, assuming the identification to be correct, this 

 cannot be a Ceylon specimen. 



With regard to the third species, which is the one particularly 

 in question, this was named Arum ceilanicum by Thunberg on 

 the herbarium sheet, but the name was not published. 

 According to Juel, the data on the sheet are " Arum ceilanicum 

 Ceil." " Colocasia indica Schott " ; that is, Thunberg wrote 

 " Arum ceilanicum " on the front of the sheet, and the locality 

 " Ceilan " on the back, while Schott subsequently added the 

 identification " Colocasia indica Schott." 



Through the friendly offices of the Director of the Royal 

 Botanic Gardens, Kew, Professor Juel has kindly furnished a 

 photograph of this herbarium sheet. It bears the name Arum 

 ceilanicum, as written by Thunberg, in the lower right-hand 

 corner, and, in the middle of the sheet at the bottom, a ticket 

 inscribed " Colocasia indica Schott. Scrips, et determin. 

 Schott." The two parts of this inscription appear to be in 

 different handwritings. At the right-hand corner of the 

 sheet is a small slip of paper, stuck on perpendicular to the 

 base, with the inscription, " Habaralle (mal)." 



Juel states that Thunberg first mounted his plants on 

 sheets 210 X 330 mm., and subsequently removed them to 



