354 Pteridophyten. 



5. rufa (Spreng.) Broadh. (Lomaria riifa Spreng.); S. Schiedeana 

 (Presl) Broadh. {Lomaria Schiedeana Presl); S, sessilifolia (Kl,) Broadh. 

 [Lomaria sessilifolia KL); 5". striata (Swartz) Broadh. [Onoclea striata 

 Swartz;; S. varians (Fourn.) Broadh. [Lomaria varians Fourn.j; 5". 

 violacea (Fee) Broadh. [Lomaria violacea Fee); and 5. Werckleana 

 (Christ.) Broadh. [Lomaria Werckleana Christ.;. Maxon. 



Lang, W, H., Studies in the Morphology and Anatomy 

 o f the Ophioglossaceae. I. On the branching of Botrychiutn 

 Lunaria with Notes on the anatom}'- of voung and old 

 rhizomes. (Ann. Bot. XXVII. p. 203—242. 2 pl. 4 textfig. April, 

 1913.) 



In the rhizomes of Botrychium Lunaria the basal, first formed 

 part bears crowded roots, while the adult region, the diameter of 

 which is greater, has the roots and leaf scars closely crowded 

 without specially elongated internodes. Often between these two 

 regions there is an intermediate region; here the rhizome is slender 

 and bears leaf scars and roots separated from one another by elon- 

 gated internodes. Of these regions the basal shows the transition 

 from the protostele to the medullated stele; above this region the 

 medullated annular stele persists with little or no secondary xylem 

 and it is here that the internal endodermis may occur. In the adult 

 region the secondar}' xj'-lem increases in amount, the leaf gaps often 

 overlap and there is never an internal endodermis. 



Six 37-oung plants were examined and it was found that in all a 

 number of roots were attached before the development of a leaf 

 trace or leaf; from Bruch mann's account it is probable that there 

 were as many earlier scale leaves as roots, and that they were 

 devoid of vascular tissue or were provided with such a small amount 

 as not to affect the stele; in some cases it may have become unre- 

 cognizable owing to cortical growth. This appeared to be the case 

 in one of the six plants in which. a first gap appeared in the stele 

 though a trace was only observable near the peripher}' of the 

 cortex. In the second there was what the author terms a leaf-gap- 

 but no signs of a trace; the trace belonging to the next gap died 

 out in the cortex and this was true too of the first traces of the 

 third and fourth plants and of the first recognizable trace ofafifth, 

 the whole of the basal part of which was not preserved. In one 

 plant onl}^ did the trace subtending the first leaf gap, though small, 

 enter a leaf. In all six, a medulla appeared in the centre of the 

 Stern before the formation of any gap; neither this nor the var^'ing 

 endodermal relations give any support to the view that the pith is 

 a cortical intrusion and in one plant, studied also by Bower and 

 figured by him there were internal tracheides in the pith of the 

 adult region, the occurrence of which Supports the intra-stelar nature 

 of the pith. The endodermis, it is true, often bends in in the adult 

 type for a little round the edges of the leaf gap, but this does not 

 seem to be an intrusion as such, an inward extension sometimes 

 commences before the endodermis of the outgoing trace breaks off 

 and, in earlier traces at least, this inward extension of the endoder- 

 mis may form a complete reparatory band across the trace about 

 to depart before the endodermis of the latter breaks awa3\ In 3'et 

 other cases the phenomena are complicated by the presence in the 

 intermediate region of the rhizome of a local internal endodermis. 

 In one plant the internal endodermis was complete for a short 



