I 



Flora of Australia. 205 



3'jtICHINIUM ALOPECUKOIDKUM, J.iiidl. "Long Tails." (Aii.Hruiitaoeae). 

 "Lorquon'* received from Stat« School, No. 2590, 5/13/1919. 

 A definite locality in Victoria for this plant. 



TmcHOMANKs PAUVULUM, Poir. (Filic«.les). 

 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 Umhraculum. flabellafum, Gottsche (Hepa- 

 ticae) the two plants liaving an extraordinary external resembl 

 ance. T. parvulum must be deleted from the list of the Flora of 

 Victoria. 



Tkiglochin centkocakpa (Hook) var. lon»icarpa. (Naiadaceae). 

 Watheroo Rabbit Fence, W.A., M. Koch, September, 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. 



-e^y^ttZ-L Ulmis CAMPESTRis, L. "Common Elm." (Ulmaceae). 



(Rate of growth.) 



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

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

 curious feature was an apparent contraction taking place during 

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

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

 In these observations the bark was left untrinmied around the 

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

 commencement and close of the observations. According to 

 Trowbridge and Weil (Science N. Series 48, 1918, 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 tliat the cracks are due to tliis contraction and not to tlie ex- 

 pansion of the frozen water. The (juestion naturally ariso,s whether 

 full precautions were taken to ensure that the measurements taken 

 were adequately standai-dised. Trowbridge and Weil mention that 



