Flora of Australia. 205- 



TjacHiNiuM ALOPECUROiDKUM, iiiiidl. "LongTiiils." (Aiiiariintaceae). . 



" Lorquon " received from State School, No. 2590. 5/5/1919. 

 A definite locality in Victoria for this plant. 



Trichomanes PAitvuLtJM, Pojr. (Filicales). 

 There are no Victorian specimens of this fern. The plants on 

 which the original record was made proved on examination by the- 

 Rev. W. W. Watts to be Umhrncuhtm- flahdlatum, Gottsche (Hepa- 

 ticae) the two plants liaving an extraordinary external resembl- 

 ance. T. parvuluiii must be deleted from the list of tlie Flora of 

 Victoria. 



TuiGLOCHiN CENTHOCAKPA (Hook) var. lonjt(icarpa. (Naiadaeeae). 



Watlieroo Rabbit Fence, W.A., M. Koch, Septem]>er, 1905. 



According to Ostenfeld, in Dansk Botanist, Arkiv. Bd. 2, page- 

 35, 1918, the above was included under I'riglochin centrocarpa. 

 Hooker, in the collection by Max Koch. 



Ulmis CAMPKSTRi.'!, L. "Conimon Elm." (Ulmaceae). 



(Rate of growth.) 



In the last number of the Contributions to the Flora of Australia,, 

 some data were given in regaixl to the growth of this tree. One 

 curious feature was an apparent contraction taking place during 

 autumn and winter, after the cessation of growtli in circumference, 

 followed by an expansion during a wet winter period (June-July). 

 In these observations the bark was left untrimmed around the 

 measurement line, and the tape used was standardised only at the 

 commencement and close of the obseii'vations. According to 

 Trowbridge and Weil (Science N. Series 48, 191S, pp. 348-550), 

 trees vary both in length and in breadth according to the tempera- 

 ture. Thus stems of Tilia europaea and Platanus orientalis in- 

 crease in diameter slightly with a rise of temperature above 32 deg. 

 F., but undergo marked transverse contraction with a fall of tem- 

 perature below 32 deg. F. They conclude that the diameter of a 

 tree is less when frost cracks are open than when they are closed, 

 and that the cracks are due to this contraction and not to the ex- 

 pansion of the fi'ozen water. The (juestion naturally arises whether' 

 full precautions were taken to ensui-e that the measurements taken 

 were ad'^^quately standardised. Trowbridge and Weil mention tliat 



