NORTH AMERICAN ANTHURUS. 505 



C", sheath of cortical tissue surrounding the fundament of the stipe. 

 a, fundament of wall of the stipe, consisting of 



6, hyphae of medullary origin in spaces which become cavities later and 



/), hyphae of cortical origin which differentiate into psendoparenchyma. 

 a', fundament of the arm. 



6', gelatinous tissue of arm of same nature and a part of b. 



p', pseudoparenchymatous layer of arms of same nature asp. 

 g, gleba. 

 t, trama. 



h, hymenial layer. 



n, connection of gelatinous masses of peridium with M and not yet cut off by completion of inner wall of peridium, i. 

 d, dome. 

 j, diaphragm. 



PLATE 49. 



Fig. 1. A plant which has passed its maturity. The removal or flowing away of the gleba discloses the cross wrinkles 



of the arms. Natural size. 

 Fig. 2. Upper portion of a plant just at maturity. Gleba is in situ yet. Natural size. 

 Fig. 3. Two eggs. Natural size. 

 Fig. 4. Half of upper portion of a plant split longitudinally — the plane of division passing between the arms. Shows 



cavernous structure of the stipe, k, passage connecting adjacent cavities which are at the base of and 



alternate with the arms. 7, passage leading into cavity of the arm. T, sheet-like masses of tramal tissue. 



x24. 

 Fig. 5. Half of an arm split longitudinally. Same lettering as before. x2£. 

 Fig. C. An egg in an advanced stage of development. Cross sections of this at two planes show the position of the 



gleba with respect to the arms. Slightly enlarged. 

 Fig. 7. Cross section of above egg at plane I-I'. Gelatinous tissues are shaded alike. At •/ the separation of 



the volva from the arms and gleba has already occurred. The cortical plates C have lost their connection 



with the arms and also with the cortical layer C. x about 2. 

 Fig. 8. Another cross section at plane II-II'. x about 2. 

 Fig. 9. Half of an egg in a very advanced stage of development split longitudinally. Separation of the volva from the 



receptaculum has taken place at q. The cavity of the stipe is also in formation, x 24,. 

 Fig. 10. Median longitudinal section of an old egg, showing the folded structure of the psendoparenchyma, p. At b" 



hyphae of chamber are connected witli the medullary tissue 3/of axis; pseudoparenchyma passes over into 



cortical layer C sXp". x 10. 

 Fig. 11. Portion of a tramal hypha with 3 lateral branches terminating in basidia. The spores are omitted from one 



basidium. x 860. 

 Fig. 12. Three spores, x 2400. 

 Fig. 13. 13a, hypha from cortical layer showing enlargements or a form of clamp connections at the sept a. x 323. 136, 



hyphae from gelatinous layer of peridium, showing similar condition, x 325. 

 Fig. 14. Longitudinal section of the youngest egg found. Lower part of figure was added from second section as the 



sections were cut very slightly oblique. At n the gelatinous masses M' are connected with the medullary 



tissue M. x 17. 



PLATE 50. 



Portion of Fig. 14 more highly magnified and from a single section, x 60. 



Cross section of half of the same egg, showing fundament of arm a', cortical plate C. etc. x 17. 



Portion of Fig. 16 showing the series of folds and furrows in the gleba that are developing at the surface of 



the cavity in which lies the fundament of the arm a'. The hymenium is here a palisade-like layer of swollen 



hyphal ends h. The inner wall of the peridium is just beginning its development, x 60. 

 Pseudoparenchyma of the stipe in different stages of development, x and x' are from the egg figured in Figs. 



14-17 ; x", from that of Figs. 20-23. x 400. 

 Very young egg of Clathrus columnatus, having greatest diameter of 1; mm. Shows broad longitudinal ridges 



caused by extrusions of the medullary tissue M. x about 6J. 

 Portion of cross section of egg in an intermediate stage of development. A portion of the cortical plate and 



gelatinous layer that would lengthen the figure 8 cm. has been omitted, x 34. 

 Part of wall of the arm from Fig. 20, y. Barren basidia are at h. x 670. 

 Radial longitudinal section of wall of stipe of same egg showing straight-walled chambers and connections z of 



medullary hyphae of one chamber with the other, x 60. 

 Fig. 23. The following section of the wall. This alone might give the impression that the chambers have no connection 



with each other, x 60. 



