275 



Sepedonium chrysospermum. Berk. Cryp. Bot., pp. 298, 304, 306. 

 ,, „ Kunze Exs. 223. 



„ „ Bisch. f. 3806. 



Bonord. Hdbk., t. 4, f. 103. 

 „ „ Karst. Exs. 387. 



Common in the conidiferous state upon various Boleti, especially B. scaber, 

 chrysentcron, suhtomcntosus, badius, and cdulis. It also occurs on Paxillus invo- 

 lutus, and upon Strobilomyces strobilaceus. Tulasne records it upon Scleroderma 

 vemicosum, Octaviana asterosperma, and Mclanogaster variegatus. 



The ascigerous state is much the most uncommon ; it was found by the 

 Rev. M. J. Berkeley at Coed Coch, and in Chapelton wood near Forres by the 

 Rev. J. Stevenson and myself in September, 1879. The infected Boletus first 

 shows signs of being affected with the parasite by producing upon its surface, at 

 some ix)int, a crop of microconidia. If it be examined in this stage, numerous 

 mycelial tubes will be seen making their way do^vnwards or towards the centre of 

 the matrix. These penetrate with great rapidity into the substance of the Bole- 

 tus. Immediately beneath the microconidia \vill now be found upon the same 

 mycelium the macroconidia. They are at first almost colourless, but soon be- 

 come faintly tinged with yellow, then golden. The whole fungus in a short time 

 becomes reduced to a mass of golden powder, which falls to pieces on the gentlest 

 touch. What the precise conditions are which favour the production of perithecia 

 I have failed to discover beyond that the too rapid development of Chlamydo- 

 spores must not take place. 



Plate i. a Portion of a Boletus with the conidia growing in a white woolly mass upon 

 its surface. Nat. size. 

 b Part of the same X 400. 

 c Microconidia X 400. 

 d Macroconidia X 400. 

 e Perfect fungus on Boletus. Nat. size. 

 / Perithecia X 20. 

 g Perithecium X 140. 

 h i Asci and sporidia X 400. 

 k Sporidia X 600. 



2. Hypomyces asterophorus, Tid. Conidia, cylindrical, pro- 

 duced from the extremities of the branching mycelial tubes ; '01- '015 mm. long 

 by '0035 mm. wide. 



Chlamydospores produced singly upon the lower and thicker portions of the 

 mycelial tubes ; spherical, rough with warts, appendiculate, eventually falling 

 into a copious fawn-coloured powder ; "02 to '02.5 mm. in diameter. 



Perithecia formed in and by the effused mycelial tubes, crowded, sessile, 

 spherico-ovoid, more or less elongated at the neck ; with acute, pervious, ciliate 

 ostiola ; pale yellow brown, sub-hyaline ; '15 mm. high by '07- '09 mm. wide. 



Asci broadly ovate, abruptly attenuated below. 



Sporidia narrowly lanceolate, curved, mucronate at either end, uniseptate, 

 pale yellowish brown ; '025- '035 mm. long by '006 mm. wide. 



