Scofidd : DICTYOPHORA RAVENELII BURT. 533 



The volva having been so tightly compressed before rupturing, 

 has its two layers so close together that they might readily be 

 mistaken for one, and the detailed structure is hard to recog- 

 nize. The outer layer is hardened and the interstices between 

 the hyphae are filled with gummy material. The inner layer 

 has its hyphoi lying for the most part in the direction of the re- 

 cent strain and connects by a thin layer with the indusium. 



The stipe is made up of several rows of irregular chambers 

 as shown in Fig. 13 in cross section. Some of these chambers 

 open to the outside, but none of them to the middle of the stipe. 

 The chamber walls, one of which is shown in detail in Fig. 17, 

 are made up of much distended hyphae which look in section 

 like the parenchymatous cells of higher plants. The chambers 

 contain filmy remnants of disorganized tissue. The remnant of 

 the tissue in the hollow of the stipe X, hangs usually from the 

 apex of the stipe or some of it may remain attached at the base. 

 The chambers of the stipe walls become smaller toward either 

 end and at the apex the wall passes into the recurved collar 

 where the contents of the chambers, though somewhat disor- 

 ganized, are not absorbed. 



The indusium which has been the cause of the trouble in 

 classification is hardly to be considered the true indusium com- 

 mon to the genuine members of the genus Dictyophora. It is 

 not a definitely organized structure, but rather the remnant of a 

 portion of the tissues of the periphery of the young sporophore 

 caught between the pileus and the base. Penzig* in describing 

 Ithypkallus tennis, speaks as follows : " Eine andere bemerken- 

 swerthe Erscheinung bei Ithy-pallus tennis ist das Auftreten 

 einer Art von Indusium zwischen dem Hute und dem oberen 

 Theile des Stieles. Auch Ed. Fischer (1. c., p. 22) kurz die 

 Andesenheit einer Haut, welche er als ' Rest der stiel und Hute 

 trennenden Primordialgewedes ' auffast. Dieses Gedielde ist 

 nicht in alien Individuen gleich ausgedildet : einmal nur als 

 ausserest, feines, durchsichtiges Hautchen, andere Male aber als 

 zienlich derbe, compacte membran, welche den Stiel kragen- 

 artig oder fast glockenformig umgiebt. Ihere structur ist nicht 

 pseudoparenchymatisch ; vielmehr ist sie aus eng verflochtenen, 

 cylindrischen Hyphen zusammengesetz." 



Burtf in describing this plant writes : " This species has been 



*Ann. Jard. Bot. de Buitenzorg, 2d Ser. Vol. I., part 2. 

 tBot. Gaz. 22. 1896. 



