Angewandte Botanik. 79 



tufts of hairs. Water-pores abound on the internodes ot the rhizome; 

 they are raised high above the arrounding epidermis, and have a 

 Wide air-chamber. Balls of fungal hyphae occur in the cortical 

 parenchyma, beside amorphous bodies of mucilage. There are two 

 or three steles in these internodes, each surrounded by an endo- 

 dermis, and the mestome-strands vary from collateral to approxi- 

 matel}' perihadromatic. The scape has no endodermis, but a closed, 

 stereomatic pericycle enclosing a circular band of many, thin, col- 

 lateral mestome-bundles, beside that a few are located in the pith, 

 collateral in the upper part of the scape, but perihadromatic near 

 the base. The leaves are membranaceous, sheathing, and destitute 

 of Chlorophyll, on the ventral face densely hairy from pluricellular, 

 clavate hairs, representing hydathodes. Chlorophyll was observed 

 only in the uppermost part of the scape, and in the ovary. 



Theo Holm. . 



Holm, T., Medicinal plants of North America. 73. Epi- 

 gaea repens L. (Merck's Report. XXII. p. 144—146. f. 1 — 13. New 

 York, June 1913.) 



Epigaea contains arbutin, arson and ericolin, known also from 

 the drug „uva ursi", as a Substitute for which it has been highly 

 recommended. According to Darlington Epigaea is poisonous to 

 cattle when eaten by them. The plant is figured and described. 

 The roots are not mycorrhizae, and no reticulated thickening of 

 the cell-walls of the inner cortex was observed, by Van Tieghem 

 detected in Arbiitus and Clethra. The stolons bear pointed hairs, as 

 well as long-stalked, pluricellular, glandulär with globose heads. An 

 endodermis, and a stereomatic pericycle were observed in the sto- 

 lons, the pith of which is heterogenous, composed of large, thin- 

 walled, inactive cells. and some of a narrowed lumen, thickwalled, 

 and filled with starch. Cork is developed from the pericycle. The 

 aerial branches show the same structure as the rhizome, but have 

 more cork. The leaves winter over, and have a thickwalled epider- 

 mis, covered by a wrinkled cuticle; stomata occur on both faces of 

 the blade; the chlorenchyma shows a bifacial structure, and the 

 pneumatic tissue shows lacunae of considerable width. 



Theo Holm. 



Holm, T., Medicinal plants of North America. 74. Ra- 

 nunculus bulbosus L. fMerck's Report XXII. p. 178—180. f. 1—13. 

 New York, July 1913.i 



Many species of the genus have similar acrid properties, but 

 R. bulbosus L. is the one that has been mostly used in North 

 America, originally introduced from Europe, and now frequent 

 in meadows and pastures from Canada to Virginia, and even 

 Louisiana. The plant with its anatomical structure is described 

 and figured. Two types of roots are possessed b}' this species viz. 

 nutritive and storage, the former, sometimes, containing fungal 

 hyphae. Characteristic of the stem, the tuberous as well as the 

 slender internodes, are destitute of endodermis and pericycle, thus 

 the mestome-strands are embedded in parenchyma, and more or 

 less supported by sheaths of stereome. The leaf has stomata on 

 both faces, but the chlorenchyma shows a typical, dorsiventral 

 structure with collenchyma and water-storage-tissue in the midrib. 

 All the veins contain Single mestome-strands of the same structure 



