Two New Basidiomycetes. H. Bourdot. 53 
others by its cystidium with thin walls, differing however from 
a gloeocystidium in that the walls are rigid and project a long 
way. H. crystallina comes therefore into Heterochaetella for the 
same reasons that numerous species have been placed in Penio- 
phora which have cystidia with thin walls, such as P. argillacea 
Bres., P. clavigera Bres., P. chordalis v. H. et L., P. detritica 
Bourd. et Galz., etc. 
This delicate species has the appearance of a loose thin 
crystalline film of ice. When older the film collapses, becomes 
less limpid, and more or less mucous. On drying the fungus 
contracts, cracks, and is reduced to fine scarious scales, which 
quickly disappear: when quite dry, there is left on the wood 
only a slightly polished stain difficult to see. The plant can be 
made to reappear if herbarium specimens are moistened, but 
only two or three times at most; after that it becomes absorbed 
into the pores of the wood. Doubtless such delicate plants 
might be preserved with advantage in alcohol. 
HETEROCHAETELLA nov. subgenus. 
Complectens Sebacinae species effusas, et genuinis cystidiis 
praeditas. 
H. CRYSTALLINA N. sp. 
Pusilla, 4-2 cent. diam. ceraceo-gelatinosa, limpida, setulis 
hyalinis sub lente hispidula, dein collapso-impressa, tenuissima, 
indeterminate et interrupte effusa; ambitu similari vel minus 
continuo, reticulato. Hyphae 0-5-3, ramis hymenium pene- 
trantibus et subinde emergentibus; cystidia tenuiter tunicata, 
cylindracea, obtusa, sparsa vel passim fasciculata, 60-180 x 
7-12 p, ad 10-45 pw emergentia; basidia obovate vel subglobosa 
8-12 x 6-9, longitudinaliter septata, 2-4 sterigmatibus subu- 
latis 5-6 w dein ad 15 p longis; sporae hyaline subglobosae vel 
obovatae, plus minus basi apiculatae, saepe uniguttulatae, 
(4)—4°5-6 x (3)-4'5 pw, latere germinantes, vel apiculo tunc valde 
elongato, conico. 
Ad ligna putridissima Pini silvestris Causse-Noir, Nov. 1914, 
Galzin, n. 16765; Juniperi communis St. Estéve, maj. 1914, 
Galzin, n. 15206-15208, Aveyron in Gallia. Ad ligna Pint 
silvestris Horsley, Surrey in Anglia, Nov. 1920, et Feb. 1g21, 
A. A. Pearson. 
Further specimens of H. crystallina having been gathered in 
several places by Mr Pearson (always on pine wood in a very 
advanced stage of decay), it is possible to add some observa- 
tions on the development and structure of this curious species. 
In its early stages, it is formed of minute receptacles, 40 to 
160 » in diameter, densely grouped, but distinct. The shape of 
