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THE MORPHOLOGY OF PHYLLOCLADUS ALPINUS 



CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY Il8 



N. Johanna Kildahl 



(with plates xx-xxii) 



The only account of the morphology of Phyllocladus is that of 

 Miss Agnes Robertson (18) in 1906, and this deals exclusively with 

 the anatomical structures and with the affinities of the genus. 



The material for the present study was collected by Dr. L. Cock- 

 ayne of New Zealand. It consisted of two collections: one of ovu- 

 late and staminate strobili, collected November 1, 1906; the other 

 of ovulate strobili, collected December 11, 1906, from cultivated 

 trees. Unfortunately, the two collections did not afford a very close 

 series, and it was impossible to get at some of the most important 

 points, as the development of the microsporangia, microspores, pollen 

 tubes, female gametophyte, archegonial neck cells, ventral cell or 

 nucleus, and embryo. Dr. Cockayne is making collections of the 

 lacking stages at the present time, and it is hoped that a complete 

 description can be presented later. Some material was also obtained 

 from Cambridge, Mass., through the kindness of Dr. B. L. Robinson, 

 consisting of three ovulate cones, taken from the Gray Herbarium 

 and collected on the Wilkes expedition in 1838-1842. At what time 

 of the year these cones were collected is not known, but they showed 

 somewhat later stages than those of the last collection made by Dr. 

 Cockayne on December 11. It is needless to say that this herbarium 

 material was very much shrunken, and it was impossible to obtain 

 from it any definite structure. 



Dr. Cockayne's material was killed and fixed in the field, in 

 70 per cent, alcohol and formalin; cut 5 ^ and 7 p thick; and stained 

 part in safranin and gentian violet, and part in iron alum. 



Staminate strobilus 



The staminate strobili are formed laterally, in clusters of 2-8 at 

 cvj. the tips of the lateral branches. Miss Robertson (18) reports one 

 t— staminate strobilus bearing an ovule at its base, which may indicate 

 ^ 339] [Botanical Gazette, vol. 46 



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