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250 DR. M. T. MASTERS ON THE MORPHOLOGY, 



Amalicd, numidica, Pinsapo ?, Fraseri, balsamea, Larix Lyallih 



americana, &c, &c. 



Stomata on both surfaces : — Fitzroya, Cryptomeria, Taxodium, 

 Sequoia, Athrotaxis cupressoides, Dacrydium, some species ot 

 Podocarpus. 



Araucaria Cunninghami (four bands), excelsa (four bands of 

 5 rows each), Balansce (4 bands of 8 rows), Cookii (2 bands of 50 

 rows), JRulei (3 bands), rnontana (3 bands), Muelleri (3 bands), 

 brasiliemis (65 rows on each side), imbricata (70 rows on each 

 side), Bidwillii (90 rows on each side) " (Bertrand). Picea nigra, 

 alba, Khutrow, polita. 



Stomata on two surfaces, but absent on the lower surface : 



Widdi 



&c. 



laxifc 



In some cases the stomata are disposed in longitudinal bands, 

 as in species of Pinus, Abies, &c, Ac, or they may be irregularly 

 dispersed, or they may occur in patches in certain privileged 



erus 



on the upper surface at the base of the spreading leaves, e. g. 

 in Juniperus drupacea. 



The position of the stomata in Conifers is very generally indi- 

 cated by the existence of a glaucous bloom *, but this is not always 



vicmi 



Picea pungens var. glauca and others, be distributed over the 

 whole surface of the leaf. 



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The Sypoderm. — Within or beneath the epiderm is usually to 



' 



X-SO 



Fig. 7. — Pin us patula. Plan of transverse section of leaf, showing epiderm, two 

 layers of hypoderm, three resin-canals in the centre of the leaf, endoderm, 

 and pericycle. 



be found a layer, or sometimes more, of long, thick-walled 

 strengthening-cells, either forming an unbroken sheet or perfo- 







Darwin, " On the Eelation between the Bloom on Leaves and the 



Distribution of Stomata," Journ. Linn. Soc., Bot vol. xxii. (1886) 























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