CARBONIFEROUS LYCOPODS AND SPHENOPHYLLS. 57 



Halonial tubercles appear as prominent mammillae-like pro- 

 tuberances. On corticated specimens the depressions between 

 the mammillae are filled up with the cortex when their apices 

 only rise to the general level of the stem or slightly above it, 

 and appear as surrounded by little rosettes formed by the bent- 

 back leaf-cushions which surround the point of attachment of the 

 caducous-stalked cone. ] 



Another important distinguishing point between the fruiting 

 or Halonial condition of LepidopMoios and the Ulodendroid 

 condition of Lepidodendron, Sigillaria and Bothrodendron is the 

 circumstance that LepidopMoios bore its fruit on the young- 

 branches, as shown by the frequent occurrence of very small 

 twigs bearing several rows of Halonial tubercles, whereas the 

 Ulodendroid stems only bore their sessile cones on stems of con 

 siderable age and size. 2 



I have been unable to ascertain the arrangement of the 

 sporangia in the cones of LepidopMoios, which when separated 

 from their parent stems cannot be distinguished from those com- 

 monly included in the genus Lepidosirobus. 



referable to the Ulodendroid section of Lycopods. I believe the plant is 

 a decorticated specimen of Sigillaria discophora, Konig sp., which is the 

 Ulodenclron minus, L. and H. It was collected by Mr. George Wild, and 

 is in the hands of Professor Weiss, Manchester, for description. 



1 Of specimens showing Halonial tubercles associated with LepidopMoios 

 leaf-cushions, the following may be cited: — Lepidop>Moios laricinus, 

 Goldenberg, Flora saroepont. foss. , PI. XVI. , fig. 6 ; the specimen figured 

 by Eichwald under the name of Halonia tuberculata in Letliaa Bossica, 

 PI. XL, figs. 1-2, show a Halonial core, but the impression shows the 

 LepidopMoios leaf-scar. Under the name of Lepidodendron laricinum, 

 Feistmantel also gives some figures which show the leaf-scar of Lepidoph- 

 loios on the Halonial stem ( Vers. d. bohm. Ablager. Abth. II., PI. VII., 

 pp. 1-2, and another on PI. VIII., fig. 1. under the name of Halonia 

 regularis). A fine specimen, exhibiting most clearly the union of Halonia 

 and LepidopMoios [L. Scotica), is given by Dr. Macfarlane in the Trans. 

 Bot. Soc. Edin., Vol. XIV., PI. VII.; and a similar condition of the same 

 species is given by me in the Trans. Boy. Soc. Edin., Vol. XXXVII., 

 Part iii., No. 25, PI. II., figs. 5-6, where I also figure a specimen of 

 LepidopMoios laricinus showing the same union of LepidopMoios and 

 Halonia. 



2 See KidstoD, Ann. and Mag. Nat. Hist., Ser. 5, Vol. XVI., p. 163, 

 PI. IV., fig. 2. 



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