ARACHNION RUFUM (Plate 73). Peridium ; eddish brown, 

 rough with adhering sand (in these specimens) ovate with an acute 

 apex, opening by an irregular aperture. Gleba brown, composed of 

 small, irregular, almost naked masses of spores. Hyphae threads very 

 scanty. Spores subglobose ; 5-6 mic. smooth, pedicellate. This 

 species differs from the preceding in its thicker, reddish-brown perid- 

 ium, larger size and gleba which is not so distinctly differentiated 

 into distinct peridioles. It seems to me to connect Arachnion album 

 to the following genus. 



SPECIMENS IN OUR COLLECTION. 



Australia, Prof. D. McAlpine. 



THE GENUS HOLOCOTYLON. 



Peridium thin, fragile, breaking irregularly. Sterile base, none. 

 Gleba consisting of a mass of spores lining irregular, confluent cells. 

 Capillitium, none. Spores (in known species) mostly pedicellate. The 

 plants composing this genus are very close to Arachnion in their 

 general habits but differ in the structure of the gleba. This, instead 

 of being in little, separate masses of spores, consists of one confluent, 

 chambered mass. We think our enlarged photograph (Plate 73, figs. 

 5 and 6) will give a good idea of the structure, but we acknowledge 

 our indebtedness to Prof. Patouillard, who has kindly prepared for us 

 drawings (figs. 94 and 95), illustrating his views of the structure of 





*** * 



Fig- 94- Fig. 95. 



the glebaf. Fig. 94 represents a portion of the enlarged gleba mass, 

 and fig. 95 the arrangement of the spores. We have received two; 

 quite distinct plants belonging to this genus. 



HOLOCOTYLON BRANDEGEEANUM (Plate 73). Peridium 

 globose, thin and fragile, yellow, breaking irregularly. Gfeba mass dark 

 brown. Spores globose, smooth, 5-6. mic. (some) with slender pedicels. 

 The specimens weje collected by T. S. Brandegee, of San Diego, Cali- 

 lorma, at Culiacan, Mexico. The plant is very close to the following in 

 its gleba characters, but is a larger species, and at once distinguished 

 by itsj^/Awperidium. 



-do not^nwTi^Or*? that u renl r ged photographs of the gleba of Arachnion and Holocotyl 



oten adhere to^7Sa tlMl L eJt ir*' Mcle " r| y" we wou ' d wish - The peridioles of Ara< 

 e together and do not show as separate grains as they really are 



254 



