Monographs Details: Phellinus magnosporus (Lloyd) M.Fidalgo
Authority: Fidalgo, Oswaldo & Fidalgo, Maria E. 1968. Polyporaceae from Venezuela. I. Mem. New York Bot. Gard. 17 (2): 1--34.
Family:Hymenochaetaceae
Description:Species Description - MACROSCOPIC CHARACTERS. sporophore: subapplanate, irregular, with few abortive pilei. pileus: subapplanate, sessile, 12 cm long, 20 cm wide and up to 7 cm thick at the base, abhymenial surface: encrusted, somewhat rigid, rugulose, dark brown, MP-8E7 (Lava — ) . margin: very thick, entire, obtuse, velutinate, more or less MP-14J8 (Maple Sugar), context: firm corky to woody, up to 6 cm thick, fulvous, i.e., medium brown, MP-14K10 (Tiffin +) or MP-14L9 (Bronze), showing many darker elliptical spots, with no white mycelial strands but limited, in its surface, by a black crust 150-250 µ thick; with KOH the trama turns black, tubes: mostly abortive, up to 1 cm deep, poroid surface: somewhat cinnammon or more precisely near to MP-14J8 (Maple Sugar); pores medium, regular, circular, 3-4 per mm, 85-125(-150) µ diam; dissepiments entire, acute to mostly obtuse, 35-80 µ thick. MICROSCOPIC CHARACTERS. surface: represented by a cutis 18-26 µ thick formed only by periclinal generative hyphae laying on a crustiform cortex composed by generative hyphae and partially by setal skeletal hyphae which are blocked by this layer and do not enter in the composition of the surface, context: hyphal system dimitic; generative hyphae yellowish, thin-walled, tortuous, mostly collapsed, with simple crosswalls, 2.5-5 (-6) µ diam, agglutinated, forming irregular strands; setal skeletal hyphae present, frequent, ferruginous, thick-walled to solid, 102-378 X 5-17 µ, irregularly tortuous to more or less straight, starting in a simple crosswall and ending in acute tips, rarely somewhat obtuse, becoming smaller near the tubes, frequently showing 1-2 backward processes, dissepiments : generative hyphae similar to the ones of the context but narrower, setal skeletal hyphae ferruginous with acute tips, smaller and projecting into the lumen of the tubes. hymenium: hyphal pegs and cystidia not seen; hymenial setae present, rare, mostly present near the base of the tubes, small, sharp-pointed, straight or a little curved, conical or somewhat subulate, ferruginous, 6-10 µ diam at the hymenial base, projecting 15-25 µ beyond the hymenium and measuring 34-50 X 6-10 µ; basidia clavate, hyaline, 4-sterigmate, 9.5-13 X 5-7.5 µ; basidiospores subglobose to globose, distinctly apiculate, hyaline, darkening to pale yellow with age, mostly thin-walled, at times with the wall just a little thickened, nonamyloid, 7-S (-9) X 6-7.5 µ.

Distribution and Ecology - Distribution. It is known only from its type locality in the Philippines, Luzon I., Bataan Prov., Lamao, H. A. Lee 48 (Lloyd 17774, BPI). Habitat, Host and Economic Importance. The type specimen was found on BURSERACEAE: Canarium villosum Benth. & Hook.; however, whether the tree was dead or alive was not stated (Humphrey k Leus, 1932: 547). This is the only record known for this species.

Discussion:

Figs. 7, 8, 38-43.

Fomes magnosporus Lloyd, Mycol. Writ. 6(Mycol. Not. 64): 1014. 1920; Humphrey Leus, Phihp. Jour. Sci. 47(4): 547-549. 1932; Corner, Gard. Bull. Straits Settlem. 5(12): 348. 1912; Stevenson A- Cash, Bull. Lloyd Libr. 35: 84. 1936; Teodoro, Enum. Philip. Fung. 303. 1937.

Type. Holotype, H. A. Lee 48, Lloyd coll. 17774 (BPI).

Type Locality. Lamao, Bataan Prov., Luzon I., Philippine Is.

Basionym. Fomes magnosporus Lloyd, 1920.

Illustrations. Humphrey & Leus, Philip. Jour. Sci. 47(4): pl. 4, fi-QS. pl. 8, figs. 1-7; pl. 9, figs. 1-5; pl. 10, fig. 7. 1932.

Discussion. Humphrey and Leus (1932: 547-549) studied carefully the species in question and showed that it is very closely related to Phellinus pachyphloeus. There are two other species quite close to P magnosporus occurring in the Philippines: P. lamaensis and P. noxius, since both have also setal skeletal hyphae in the context. According to Humphrey and Leus (1932), P. magnosporus lacks hymenial setae. If this were true, in this respect it would be similar to P. noxius and P. melanodermus. However, although rare, I found hymenial setae near the base of the tubes. From P pachyphloeus and all other "species of its group, P magnosporus may be easily separated by the size of basidiospores and pores which are much larger in P. magnosporus. Lloyd (1920: 1014) stated that the basidiospores are 11-12 ยต diam. I was not able to find any so large nor did Humphrey and Leus (1932). Most characteristics are like those of P. pachyphloeus showmg that this species is its clo.se.st relative. Phellinus portoricensis differs from P magnosporus by being the only one in the group with a duplex context and "basidiospores yellow from the beginning." Snice the basidia were not overmature, it was not possible to determine whether or not they form the honeycomb structure similar to that in P. magnosporus, a structure which is usually easier to see, if present, when basiflia are old and collapsed.