1889.] occurring in tie neiyhhonrhood of Simla. 287 



A fresh typical spore just moistened measured 30 ft in total length (15 

 to each cell) and 16 fj. in breadth at the septum. Spores which had lain 

 some hours in water measured on an average as follows : — whole length 

 30.6 fi. ; length of upper cell 15-6 /t ; length of lower cell 14-8 /x ; breadth 

 at septum 17-6 Among the spores were some fine paraphyses. There 

 is a curious tendency in these spores to divide into more than two 

 cells : for example I once saw a spore divided into 4 cells each 10 /j. in 

 length, the breadth of the septa being 19 /u. ; on two other occasions I 

 saw a spore divided into 3 cells suggesting a comparison with Phrag- 

 midium spores. The epispore is beset with coarse warts or tubercles 

 over both cells. I frequently placed these spores in water with a view to 

 observing their germination, but on two occasions only succeeded in seeing 

 commencing germination only in the upper cell. In one case after five 

 days I saw a spore with a promyceliuni from the free end of the 

 spore 22 /i long and 8 /a broad with colourless granular contents. In 

 another case I saw the same after 48 hours, but in neither case did 

 development proceed any further.* 



Bemarhs. — I have named this species provisionally Puce. Geranii 

 silvatici, Karsten, but it is quite possibly a new species. It does not agree 

 with the characters of P. Qeranii, Cda. 



c. Hemipuccinia. 



6. PUCCINIA RoSCOEiE, nov. sp. 

 on Boscoea alpina, Royle. 

 In September the leaves of this plant are often found attacked with 

 a Pftccimm-bearing fungus. Small pustules with a tendency to coalesce 

 are found on the under surface of leaf blades, each surrounded by an 

 area of paled tissue. Sometimes neighbouring areas coalesce, but as a 

 rule each pustule remains distinct from its neighbour. Each pustule 

 usually contains some uredopores also, which are oval, beset externally 

 with a few spines, containing orange-yellow matter, and measuring 

 28 X 18 when moist (Fig. 1, PI. XII). The toleutospores measure 

 ■when moistened 32 in total length each, all being nearly equal in size 

 (16 /A in length). The upper cell is usually somewhat broader than the 

 lower, measuring 17 against 15 jx, and is thickened at its free extremity. 

 The spore is constructed at the septum (Fig. 1, PI. XII). These spores 

 commence to germinate readily in water at once after ripening, but I have 

 not observed the formation of sporidia. These are probably formed only 



* As this paper was passing through the press, I observed the complete develop- 

 ment of promycolia in the normal way. The promycclia are short and bear sporidia 

 measuring 12 x 6 fi. Secondary sporidia are ouuasionally formed. 



