20 BOTANICAL GAZETTE ■ [july 



Figs. 42-45. — Changes taking place in trama of gills during' development. 



Fig. 42. — Part of gill from fig. 25; X225. 



Fig. 43. — Part of gill from fig. 26; X 225. 



Figs. 44, 45. — Parts of gills from figs. 27 and 28; X225. 



Fig. 46. — Some of hymenium of basidiocarp shown in fig. 28; X225. 



Figs. 47, 47a. — Parts of gills from basidiocarp shown in figs. 19-22, 37, 38; 



X585. 



Fig. 48. — Similar section to those of fig. 47 from slightly older fruit body 

 (see text fig. 5); X585. 



Fig. 49. — Single basidium in detail; X936. 



Fig. 50. — Free-hand section of gill of Pluteus seticcps Atk. MSS; X 225. 



PLATES IV, V 



Tubaria furfuracea 



Fig. 51. — -Median longitudinal section of undifferentiated primordium of 

 basidiocarp; y.T):i. 



Fig. 52. — Median longitudinal section of early stage in differentiation of 

 basidiocarp showing primordia of stipe, pileus, and blematogen;- X33. 



Fig. 53. — Median longitudinal section of basidiocarp intermediate in 

 development between figs. 51 and 52; y.^. 



Figs. 54, 55. — ^Median and tangential longitudinal sections of slightly older 

 basidiocarp showing primordium of hymenophore as a deeper staining region 

 on under surface of pileus; y\2)i- 



Figs. 56, 57. — -Median and tangential longitudinal sections of basidiocarp 

 just older than fig. 54; y.2>?)- 



Figs. 58, 59.— Median and tangential longitudinal sections of basidiocarp 

 with well developed palisade layer and more definite rift below; y.i2>- 



Figs. 60-63. — Median and tangential longitudinal sections of basidiocarp, 

 showing first traces of gill salients; Xn- 



Figs. 64-68. — Median and tangential longitudinal sections of young 

 basidiocarp showing centrifugal development of gills; Xn- 



Figs. 69-73. — Median and tangential longitudinal sections of older basidio- 

 carp showing centrifugal development, attachment of gills, and breaking up of 

 blematogen layer into flaky particles over pileus; y.i2>- 



Figs. 74-76. — -Median and tangential longitudinal sections of basidiocarp 

 nearing maturity; secondary gill development shown in figs. 75 and 76; X33. 



Fig. 77. — Transverse section of basidiocarp showing arrangement and 

 branching of primary and secondary gills; X12. 



Fig. 78. — Upper part of section shown in fig. 51 ; X 200. 



Fig. 79. — Detail of upper portion of basidiocarp shown in fig. 52; X200. 



Fig. 80. — Detail of upper portion of basidiocarp shown in fig. 54; X200, 



Fig. 81. — Upper portion of section shown in fig. 56, showing structure of 

 hymenophore and veil; X200. 



