EXOBASIDIUM 725 



EXOBASIDUNEAE. 



**Parasites. 



EXOBASIDIALES. 



Hymenium effused, rarely consisting of basidia only. Parasitic on 

 leaves, etc. (especially Ericaceae). 



EXOBASIDIACEAE. 



Same characters as the order. 



Exobasidium Woronin. 



(e, out of; basidium, a basidium.) 



Mycelium vegetating in the interior of the living host, and giving 

 rise, on the exterior, to basidia. Hymenium discontinuous. Spores 

 white, elongate fusiform, or oblong reniform, smooth, simple, or 

 septate; basidia cylindrical, with 4-5-6-sterigmata. Cystidia none. 

 Parasitic on living leaves and stems. 



2476. E. Vaccinii (Fuck.) Woron. (= Exobasidium Andromedae Peck; 

 Exobasidium Azaleae Peck; Exobasidium Rhododendri Cramer.) 

 Engl. & Prantl, Nat. Pflanzenfam. I, 1**, fig. 65. 



Vaccinium, whortle-berry. 



Galls 1-2 cm., greyish, innate, effused, hypophyllous, or amphigenous, 

 usually orbicular, or elongated, forming a scurfy or felted hymenium. 

 Spores white, elongate fusiform, often curved, 10-20 x 2-5-5 /JL, some- 

 times 1-septate, and becoming 3-septate on germination. Leaves, 

 young shoots, and flowers of Vaccinium Myrtillus, Vaccinium Vitis- 

 idaea, Rhododendron ferrugineum, Rhododendron hirsutum, Rhodo- 

 dendron Wilsonii, and Azalea pontica. May Oct. Not uncommon. 

 (v.v.) 



2477. E. japonicum Shirai. Japonica, Japanese. 

 Galls 1-3 cm., subcuticular. Spores oblong-reniform, 14-5 x 4//,. 



Leaves and terminal shoots of Rhododendron indicum. Uncommon. 



HETEROBASIDIAE. 



Basidia longitudinally divided, transversely septate, or simple; 

 spores on germination producing sporidiola, or a mycelium, but the 

 former only in the case of the simple basidia. 



AURICULARIALES. 



Basidia transversely septate, cylindrical, straight, or curved, con- 

 sisting of either probasidia, or normal basidia. Spores producing 

 sporidiola, or a mycelium on germination. 



