STILBUM. 443 



Tarn. in. STILBEAE. 



Series I. Hyalostilbeae. Sacc. 



Sect. 1. Amerosporeae. Sacc. 



STILBUM. Tode. (figs. 20-22, p. 442.) 



Stroma subterete, usually elongated and stem-like, com- 

 posed of agglutinated hyphae that become free above and 

 form a more or less swollen Lead ; conidia minute, con- 

 tinuous, borne on the tips of the hyphae forming the head, 

 at fijst involved in mucus. 



Stilbum, Tode, Fung. Mechl., i. p. 10 ; einended by Sac- 

 cardo in Mich., ii. p. 32 ; Sacc, Syll., iv. p. 564. 



The distinct, simple or branched stem bearing a single 

 head, and the conidia involved in mucus characterise the 

 genus. Small fungi, rarely exceeding ^ of an inch in 

 height. 



Stilbum orbiculare. B. & Br. 



Forming white patches an inch or more in diameter, 

 ^springing from a white, thin, pulverulent stratum, stem 

 cylindrical, tomentose, often with a torn frill-like structure 

 at the apex ; head globose ; conidia cj-lindrical, 5 x 2 /a. 



Stilbum orbiculare, B. & Br., Ann. Sci. Xat., n. 1714; Sacc, 

 SyU., iv. n. 2676. 



On lAndbladia effusa. 



fungus ; — Fig. 10, Epicoccum purpurascens, section of ; — Fig. 11, coni- 

 dium of same; — Fig. 12, Endodesmia glauca; — Fig. 13, Bactridium 

 hehellae, spore of;— Fig. 14, Fttsarium solani; — Fig. 15, Graphium 

 sutmlatum ; — Fig. 16, Isaria citrina, and portion of a branch showing 

 origin of conidia; — Pig. 17, Feriola tomentosa; — Fig. 18, Hymenvla 

 rvhetla; — ^Fig. 19, Sporocyie iyssoides; — Fig. 20, Stilbum citrinellum ; — 

 Fig. 21, section of head oi same, showing it to consist of hyphae spreading 

 from the stem ; — ^Fig. 22, hyphae hearing conidia, from head of same ; — 

 Fig. 23, Ceratium hydnoides ; — Fig. 24, Tubereularia ewmymi ; section of 

 fungus and curved condiophore; — Fig. 25, Cylindrocolla urticae; — 

 Fig. 26, lUosporium roseum ; — Fig. 27, Fusarinm betae ; — Fig. 28, Splia- 

 celia eegetum; — ^Fig. 29, Selicosporium ramogum. (All the figures are 

 highly magnified.) 



