246 The Plant World. 



miles east of Vail. With the more common hosts already men- 

 tioned were againfound Parkinsoniamicrophylla,Acaciaconstricta, 

 and Condalia spathulata in the Catalina foothills. At Quijotoa 

 Pass, in the Tucson Range, Olneya tesota proved to be still another 

 host. 



In summing up, it is found that the desert mistletoe has thus 

 far been detected upon seven hosts, all desert trees and shrubs, 

 while the various forms of P. /lavescens occupy 17 hosts and occur 

 on trees only, and excepting the one mistletoe on Ga nbel oak, 

 exclusively Upper Sonoran. Two more species of Phoradendron 

 are confined to two junipers each, another species or variety to 

 white fir, and Razoumofskya to the pines. The ten species and 

 varieties of mistletoe have thus far been located unon a total 

 of 31 host species. 



Tucson, Arizona. 



A NOT I{ ON TWO SPECIES OF THE GENUS CALOSTOMA. 



By Howard S. Reed. 



The r.iembers of this genus, while not abundant, a->pear to 

 have a wide distribution. The plants, on account of their pe- 

 culiar shape and unique appearance, are quite striking objects 

 and \crv interesting to the collector. At maturity, the little 

 stalks, formed of reticulated and anastomosing cords, bear aloft 

 a delicate fruit body in which the spores are contained. The 

 exoperidium early becomes gelatinous and, splitting fron below 

 upwards into radial strips, falls away, exposing the per- :anent 

 endcperidium. The wall of the endoperidium opens at the top 

 by four to seven teeth whose inner surfaces and margins are 

 brightly colored. The corona of teeth opens into the spore sac, 

 which, at maturity, slowly contracts, forcing the spores out be- 

 tween the valve-like teeth. 



In America the first species appear to have been described 

 by Plukenet* in 1691. Since then numerous mycologists have 

 noted, in one way or another, the characters of this genus. 



Calostoma cinnabarinum (fig. 1) appears to be one of the 

 most widely distributed species of this genus and was undoubt- 

 edly the one described by Plukenet. In his monograph of the 

 genus Calostoma, based upon material in the British Museum, 

 Massee f assumes reasons for including C. lutescens (fig. 2) in 



•Phytographia, p. 184, 1691. 



tAnnals of Botany, Vol. II, p. 25 1888. 



